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Hi, Nataly. The answer is surprisingly very simple. All you need is a clean rag. I've attached a link for more info and instructions. Good luck with your concert on the 17th. I'm sure you will excell and bring down the house! Happy holidays to you and yours! Cheers!

If you're very, VERY careful you can get the excess rosin off with a bit of rubbing alcohol. The alcohol dissolves rosin but it also dissolves varnish. First, cover the top of the violin with several layers of cloth to protect the violin. Then, away from the violin, put some rubbing alcohol on a cotton ball or soft cloth. Squeeze out any excess that might drip. Then carefully clean the strings, wiping with a clean cloth when you're done.

In the future, don't use so much rosin. Buildup like that means you're using way too much. You don't need to slather more rosin on the bow every time you take the violin out and play for half an hour. One application lasts for a few hours of playing time.

Although alcohol can be used to clean strings it is very dangerous. A dry cloth will only take off the loose rosin. What professional violin repairman use is Zylene, which is also dangerous because of the fumes. We also use Steel Wool but only the OOOO grade and with a little oil. This of course needs to be cleaned up well before the bow is pulled across the strings. Once cleaned, then the dry cloth works well, especially a microfiber cloth. You should be wiping down your strings and instrument after each practice.

You can use a cloth this can be slightly damp if there is allot. In the future try and clean the strings regularly and keep your cloth in your violin case for easy access.

Good luck in your concert.