Vinegar works better or as well. Acetic acid is one of the solvents in
most silicone caulks. And it doesn't leave an oily residue.
Acetic acid is good.
I use toulol or toulene based carbuerator cleaner.(It comes in a spray
can, also has acetone.)
It's a good silicone solvent and cleans just about anything off.
Good for removing paper labels and adhesive off of glass jars.
78 cents a can at Wal-Mart. Super Tech brand.
Also good for cleaning video and audio heads and tape guides,
rollers.(Just spray it on a swab and wipe, leaves no residue.)