Help! I just purchased an old mirror, and the ornate scrolled frame is caked with old dusty build-up in the recessed places that doesn't want to come off with ordinary wiping. It's gold (probably paint rather than leaf--I'm afraid I will strip away the finish if I use anything strong) and many places are hard to reach, but even with a Q-tip and everything I've tried, the crud doesn't budge. I've tried: water, alcohol, canned air, old toothbrush, fine steel wool. Someone please help me!

Thanks!