By the Player

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Cleaning
The recommended method of cleaning is to use a soft cloth to remove rosin dust, oil, and dirt from the bow stick immediately after each use before it has a chance to sink into the finish.  Special untreated cloths may be purchased specifically for cleaning instruments and bows.  If a treated cloth must be used, one should take great care not to get it near the hair of the bow.  Other cloths may also be used provided they are soft, lint-free, and non-abrasive.

There are wide varieties of polishes and cleaners available for stringed instruments which may also be used on bows.  However, if a bow is properly maintained, these products will not often be necessary.  If using a polish or cleaner, always test for compatibility with the varnish in a small inconspicuous area of the bow and take special care to keep the product well away from the bow hair.  On a related note, using commercial or household solvents near an instrument or bow is to be avoided since, in some cases, even the vapors can cause serious damage.

Left unattended, the silver or nickel fittings found on the frog, button, and sometimes the tip will tend to oxidize over a period of time.  While a heavy layer of tarnish should be cleaned by a technician, its appearance can easily be prevented by including the frog, button, and tip in the daily cleaning with a clean, untreated cloth.  Over the course of time, bow hair near the frog may darken with a buildup of skin oils and rosin.  When such a buildup becomes noticeable, the best and safest solution is to have the bow rehaired rather than to attempt to clean the hair by mechanical or chemical means.

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Humidity
Humidity control is of equal importance to bows as it is to instruments.  Too much or too little humidity can be the cause of warping, cracking, and improper hair tension.  Here is a guide for maintaining the proper level of humidity: 

In climates with severe seasonal temperature and humidity fluctuations, maintaining consistency can be a difficult task.  While several case- or instrument-held humidifiers are available, it is most advisable to humidify or dehumidify the environment in which the instrument and bow are kept the majority of the time.  It is important to remember than humidifiers for use inside the case or instrument are only effective when the case is closed.  Once the case is opened, all of the humidified air quickly vanishes.  Humidity is most easily measured with a wall-mounted hygrometer kept in the same room where the instrument is stored. Smaller hygrometers are available, but they may not give as accurate readings.  Bow may, of course, be taken from their properly-humidified environments in order to be played for reasonable periods of time.  This may be done without harm as long as the bow is returned to its environment of proper humidity before the wood and hair lose or gain an undue amount of moisture.

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Temperature
In addition to that caused by drastic humidity changes, bows are also susceptible to similar damage caused by rapid fluctuations in temperature.  While in colder climates it is often impossible to avoid subjecting a bow to low temperatures, it is important to make certain that the rate of temperature change is as slow as possible.  This may be accomplished by allowing an instrument and bow to warm up to room temperature inside the case.

Excess heat may soften the finish which can pick up impressions of the case lining fabric or, in extreme cases, may “alligator” or cause the bow to stick to the inside of the case.  Instances of excess heat can happen at any season and are most often caused by leaving the case in the direct sun, next to a heater, or unattended in either the passenger or luggage compartments of an automobile.

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Rosin
The most common questions about rosin concern stickiness, rosining technique, rosining frequency, and cleaning up excess rosin.  A large number of rosins are commercially available varying in shape, packaging, color, grade, special additives, and recommended instrument.  Violin, viola, and cello rosins will vary in stickiness with light rosins usually providing less grab than dark rosins. Less grab is usually desirable for violinists or in high heat and humidity climates. More grab is appropriate for cellists or in low temperature and humidity locales.

Rosins for violin, viola and cello can generally be quite similar.  Bass rosins are quite soft by comparison giving a substantial amount of grab necessary to move thick, low-pitched strings.  While a number of rosining techniques exist, the goal of each is to evenly coat the hair with just the right amount of rosin–just enough to grip the strings properly, but not so much that excess rosin powder quickly coats the instrument and bow.  One time-tested method of rosining violin, viola, and cello bows is to use long, slow strokes back and forth along the entire length of the hair.  Bow hair which needs more rosin will cut into the rosin cake, while hair which is sufficiently rosined will slide easily over the cake on a layer of powdered rosin.  Bass bows are traditionally rosined in quick, long strokes from the frog to the tip as bass rosin is too soft to allow the successful use of up and down bow strokes on the rosin cake.

Rosin which is not mounted in a wood or plastic block should be rotated gradually as it is being used.  This rotation will maintain a flat surface allowing for the best rosin-to-hair contact and will also prevent damage to the sides of the bow caused by deeply grooved rosin.  Rosining frequency is affected by personal preference, instrument type, rosin brand and grade, temperature, humidity, and the amount of time spent playing.  One might expect to rosin a bow anywhere between every few hours to every few days.

As mentioned above, use a dry, clean, lintless cloth each day to wipe rosin dust from the bow stick and the surface of the instrument before it has a chance to sink into the finish.  A clean, dry cloth should also be used periodically to wipe rosin build-up from the playing area of the strings.  Rosin which is allowed to accumulate too heavily, especially on the undersides of the strings, will adversely affect the tone and playability of the instrument.

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By a Technician

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Cracks and breaks
Repair of any crack, split, or other break of the tip plate, the head of the bow, the shaft of the bow, the frog, or the button should always be performed by a technician.  Well-intentioned but improper amateur repairs can often break again, cause further damage, and/or reduce the value of a bow.

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