Recently had bathroom remodelled. The contractor was asked (politely) to remove the "gunk" around the sink drain collar. He used his finger nail to scrape the surface of the drain collar, which had a lacquer finish. The (silicon) gunk remians.
When replacing that drain collar I will also want to remove the silicon used as a sealant from the sink baisn where teh drain collar sits. Any suggestions for a solvent for this purpose ?