In article . net, Edward
Hennessey says...

Should you want to try different potential solvents, you can avoid their
evaporation by building a small dam around the target area with
modeling clay, caulk or some other removable sealant

I know from experience that one good way of trapping a
small volume of solvent on a surface like that is by
simply laying a small O-ring over the item you want
to soak off. The surface tension will actually
keep the solvent inside the ring - only a tiny
amount will weep out from underneath. Periodically
drip a bit in to keep up with evaporation.

Jim

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