an electronic spray cleaning wash might work well for this.
Read the instructions on the can; some are not plastic-safe so you have to be careful where the solvent lands in that case. The spray can tip typically has a hole for attaching a straw (such as a can of WD-40). Actually WD-40 might even work but probably shouldn't use that it's messy and the oily residue attracts dust.
Use a cleaner solvent *without* any oil (some are oil based) for the same reason.
Radio Shack might have what you need or try an auto supply store. Electronics supply houses carries these products in many forms.
In any case do not use anything abrasive.
Read the instructions on the can; some are not plastic-safe so you have to be careful where the solvent lands in that case. The spray can tip typically has a hole for attaching a straw (such as a can of WD-40). Actually WD-40 might even work but probably shouldn't use that it's messy and the oily residue attracts dust.
Use a cleaner solvent *without* any oil (some are oil based) for the same reason.
Radio Shack might have what you need or try an auto supply store. Electronics supply houses carries these products in many forms.
In any case do not use anything abrasive.