Maintaining your instrument and bow

• Always wipe dust, sweat and rosin off the instrument and fingerboard after playing with a soft, non-scratching, lint-free cloth. There are commercial cleaners and polishes available, but they contain solvents and abrasives that might damage your varnish. If you already have a build-up of dirt and rosin on your violin have it cleaned by a violinmaker. Stay away from the varnish with household cleaners and anything containing alcohol.
• Try to handle your instrument mostly by the neck to avoid getting dirt and oils on the varnish. If you always rest your hand on the same spot of the body in playing pauses you can wear the varnish away or dissolve the glue with the moisture of your hand. The right upper rib, which you already touch when you play in high positions, is often affected by this kind of wear. A violinmaker can protect this area with a layer of protective varnish or in bad cases with some plastic foil. Some makeup and aftershaves can also damage the varnish near the chinrest. Try changing the product or covering the area with a cloth when playing.
• Confine stickers, tape etc. to non-varnished areas if possible. They can take pieces of varnish with them when you remove them.
• Finally, make sure your shoulder rest doesn't scratch the varnish. The little rubber tubes on the feet can be replaced at low cost if they wear out. On a tailpiece with fine tuners make sure they are not turned in so far, that they touch the violin. Turn the screws of the fine tuners out and retune the violin at the pegs once in a while.

Keeping an eye on your set-up

The bridge

Make sure your bridge is straight. It takes a lot of pressure and is submitted to a forward pull when you tune your strings. As a result it can start to lean forward, warp over time and eventually fall over or break The backside of the bridge (towards the tailpiece) should be flat and at a right angle to the violin top. The front is slightly arched for more stability. Have your teacher or violinmaker show you how to straighten your bridge. If it's already warped your violinmaker might be able to bend it out. The tendency of the strings to pull the bridge forward will be bigger when they have cut deep grooves in the bridge, because they can't slide through the grooves easily enough (this can also damage the strings). Especially on the thin strings, have the groove protected by some parchment and/or use the little protective plastic tubes provided with your strings. Sometimes, usually after receiving some kind of knock the bridge can also move sideways. You'll notice that, because the strings will be moved to one side of the fingerboard. Take a note of where your bridge is and show it to a violinmaker if you think it has moved they can easily correct it.

The soundpost

You can see your soundpost when you look through the right F-hole of your instrument (treble side).It should stand straight and a small distance behind the bridge. The position of your soundpost can have a substantial effect on the sound of your instrument, but never try to adjust it yourself as you can cause serious damage. If your soundpost falls over immediately loosen the strings to take the pressure off the top of your instrument. (Always put some cloth under the tailpiece when you do this to prevent it from scratching your instrument). It is a relatively simple operation for a violinmaker to set the soundpost up again.

The pegs

Changes in humidity can make pegs slip or get stuck. Pegs and pegholes as well as the holes for the strings also get worn out over time. If a peg slips try wiping off excessive peg dope or rewinding the string, but be careful, don't force the string against the pegbox, you could damage both the string and the pegbox. If the peg keeps slipping, it probably fits badly and you should see a violinmaker. Generally, don't push the peg into the pegbox using force or forcefully try to remove a stuck peg, you could crack the pegbox. Lubricate pegs that creak or are hard to turn with a bit of peg dope. A quick fix is rubbing them with a bit of dry soap but as soap attracts moisture this is not ideal. A first aid for a slipping peg is a bit of chalk, but it's not ideal in the long run either because it's abrasive. If you use steel strings you'll generally have a hard time tuning with the pegs, because steel strings need less stretching to change pitch. Make your life easier with fine tuners.

The fingerboard

A good fingerboard is made from hard, dense ebony. Even so you will eventually wear grooves into it and the fingerboard will need planing to prevent buzzes from developing and also just for better playing comfort. The fingerboard also needs to be slightly hollowed to give the strings room to vibrate. Eventually the fingerboard will get too thin to get planed and will need replacement. This doesn't happen very often though, so your fingerboard should last you a long time. Unfortunately you will wear out your fingerboard faster when you have somewhat acid sweat. Washing your hands before playing and keeping your nails short and smooth helps prolong the life of your fingerboard and strings. If your fingerboard falls off, loosen the strings (as for a fallen soundpost), otherwise the neck of the instrument can deform.

Changing strings

• When in an orchestra or a similar situation with lots of people around: make sure your instrument is out of harms way. The safest place for a violin or viola in a playing break is in the case. Don't let them lie on the chair or floor where people can sit or step on them. The same goes for your bow. Don't put it on your music stand either, it can easily fall off. Put a cello down on its side and stick the endpin back in to prevent people stumbling over it. Your bow is reasonably safe lying on the ribs of the cello. Be also a bit careful when you pick the cello up again. Over time the floor material can damage the edges. It sounds funny, but thick carpet can actually be bad as fibers can get stuck in rough spots in the wood and tear splinters out.
• When putting the instrument in its case: It's easy to forget to take the shoulder rest off when you put your instrument in the case. If you meet any resistance when closing the lid, stop! Also make sure the bows are secured so that they can't scratch the instrument. It's a good idea to wrap the instrument in a cloth or put a cloth on top of it for extra protection. Finally make sure the case is actually closed before you pick it up.... With a cello in a soft case keep in mind, that the bow is only safe with the cello in the hull. Always take the bow out before the cello and put it back in after the cello. Some cello hulls also have unprotected zippers that can scratch the cello. Pull them away from the cello when you open or close them or get a different hull.
• Transporting your instrument in the car: a good place for your violin is on the floor in front of the back seat: it's in the shade and can't move around. The trunk is a dangerous place, especially in summer. It can get so hot that the varnish forms bubbles and the glue disintegrates. Like with any valuable item, don't leave your instrument unattended in the car.
• Airplanes: At least on international flights I was always able to take my violin along as hand luggage, but if you want to be on the safe side check with the airline beforehand, there's sometimes an issue with the length of the case. Airplanes are dry places, so it's probably a good idea to use a dampit or other humidifier in the case. The situation is more difficult for a cello. You'll probably have to pay for an extra seat if you want to take your cello into the cabin (if you are allowed to take it at all), otherwise it has to go into the hold. In that case, use as solid a case as possible. Put some padding under the tailpiece and around the bridge and stuff out empty space around the cello. You could also ask your violinmaker to remove strings, tailpiece, bridge and soundpost. With the string pressure gone some more serious damage might be prevented. But then you need to have it reassembled again at your destination and you might not get the exact same set-up again.
• At home: Keep your instrument in a safe place away from heat and direct sun. If you don't have a cello stand put your cello on the side, even if you keep it in the case. The case can fall over too. If you want to hang your violin on the wall choose a dry inside wall and hang a cloth behind it. You can also hang the bow on a nail. If you do, hang it with the frog pointing down, there will be less damage when it falls off.
• Storing your instrument away: If you don't intend to use your instrument for a while, have your violinmaker remove strings, bridge and soundpost. Make sure the bow hair is loosened and store instrument and bow in the case in a place where it isn't subjected to extreme temperatures or humidity. A closet could be a good place. Don't put it in a place like the garage or attic. Check it once in a while for cracks, open seams and bugs. You could add some mothballs to keep bugs away.

If an accident has happened

Don't touch or move fresh cracks and have them repaired as soon as possible. The repair will turn out nicer if there's no grease or dirt or frayed edges. If a piece breaks off keep it and any splinters you can find in a box and have it reglued as soon as possible. It will save you money if the violinmaker doesn't have to fit a new piece. Take the stress off the affected area: loosen the strings, don't force a peg in a cracked pegbox etc. Finally, it might be tempting, but don't try home repairs, you can make things worse.

The influence of the weather

• Always loosen the hair of your bow after playing. If you leave the bow under tension all the time the stick will eventually deform and you also stretch the hair prematurely. The hair of the bow is also very sensitive to humidity and shrinks quite a bit in dry air. If you don't loosen the bow hair it might get so tight that the bow tip snaps off!
• Your bow is pretty delicate and the head breaks quite easily which substantially reduces the value of the bow. Don't rap it against the music stand, gesture (or play-fight) with it.
• Wipe the rosin off the stick after playing and avoid touching the hair with your fingers. Your hands are naturally a bit oily and that can make the hair loose grip.
• If you find you can't tighten the hair enough any more don't use force or you can split the stick. Maybe the bow hair has become too long and the frog simply can't be moved back far enough on the stick any more. You can test this by loosening the screw and pushing the frog as far forward as it will go. The ribbon of hair should just be slack. If you have a loose loop of hair hanging down your bow, it's too long. It will also cause the thumb to rest on the wood of the stick instead of the thumb leather and you'll eventually wear the wood away in that spot. Another reason might be a worn eyelet. The bow screw runs through the eyelet which attaches to the frog. It wears out and must be replaced once in a while. A worn or loose eyelet can also cause the frog to wobble on the stick.
• Have your thumb leather replaced when it gets worn to prevent damage to the stick. Some people actually prefer putting the thumb on the wood of the stick, but that's not good for the bow. Try asking your violinmaker or bow repair person for a thinner leather if that feels more comfortable.
• If part of the faceplate on the tip of the bow comes off, have it replaced as soon as possible. It's not just ornamental, it also protects the tip from wear.
• Bow bugs (I think they are officially called museum beetles): They are some tiny beetles that sometimes infest bow hair, usually bows that have been sitting in the case undisturbed for a while. Once the case is infested they can also attack more recently rehaired bows. Telltale signs are several hairs broken off in a line and broken hairs with frayed ends. You might also see the larvae or shells. Have the bow rehaired and vacuum the case thoroughly or throw it out. Bugs of all kind are usually not a problem when you play regularly.

When is it time for a rehair?

That depends largely on how much you play. Professional players might need quite frequent rehairs. As a student or amateur you might be fine for a year or even longer. It is time for a rehair when you feel the hair looses grip and you want to rosin it more and more often. You shouldn't need a lot of rosin to keep the playing quality consistent. Once every couple of times you play should be enough. If you have rosin dust collect on your instrument and strings every time you play you are using too much. If the hair is fairly new and the ribbon intact and you still loose grip the hair might just be dirty and can be cleaned (I offer this service for free for bows I have rehaired). Another obvious reason for a rehair is a lot of broken hairs. Since bow hair is so sensitive to moisture, tell your bow person before a rehair if you'll be using the bow in a very dry or humid environment, so that they can adjust the length accordingly.