Actually, the wires aren't THAT fragile, and I don't think they're porcelain. I dissected a friend's damaged MAFS, and those little wires were pretty tough to cut through.
Bending them with a Q-tip isn't a good idea, though.
Non-chlorinated brake cleaner won't leave any residue behind, so it's safe to use. I was told to use it by Boosted2.0 on New[/b]Celica[b]
.org, and he's one of the most knowledgible people on Toyotas I have ever seen.