Old Master Orange String Cleaner and Rosin Remover is a non-toxic cleaning formula for violins, violas, cello and bass. It has been formulated to take advantage of the powerful cleaning action of d-limonene found in oranges, while reducing its finish-stripping properties. In order to do that, we blend it with various non-toxic solvents. This way, the Old Master Orange String Cleaner cleans the instrument without damaging the instrument.