|Hi Woodloper, |
a cleaner I use a lot of is Surgical Spirit (SP), although it should be kept away from any printing, as it might remove it.
SP dries quickly leaving no residue.
Use dampened (not soaked) Q-Tips / Cotton Buds as Dave suggests, or dampened white kitchen roll. If not white, any colour(s) might transfer to item being cleaned and become permanent. (some plastics absorb).
SP polishes, so is good on plastic, but always test first where it will not show.
e.g. have used to remove shallow scratches from mobile phone screens.
Good Luck - Keep us posted