Cleaning audio components with 90% isopropyl alcohol

No plastic parts, no epoxy, no finish, just for starters.

Acetone.    Stay away, like the plague.

No plastic parts, no epoxy, no finish, just for starters

Also, removes paint, dies, and decals.

Someone mentioned CRC. Great suggestion. Get the plastic-friendly type of contact cleaner, in the red and white can, if available.

Why not use a plain dry q-tip?

I have always used Kontak Audio Cleaning Fluid and it works wonders. Dries supper fast and no residue.