It all depends on what type varnish your bass has. I see you have a Juzek....if you're lucky enough to have a French polish on it, it can be repaired really easily. As 151 says, alcohol is the solvent for shellac and French polish is shellac rubbed on with alcohol. This is a real art. You probably have the original Juzek varnish on it and you'll have to find out what exactly that is. How big is the spot or spots?
I'm sure one of the luthiers will chime in. Also Ken Smith has alot of general knowledge about Juzeks......
I'm praying to the BASS GODS for you.
