The only parts of the Monotype pump head left to clean are the three long springs. To soak these in paint remover I made a trough from aluminum foil with the ends folded over several times. Some scraps of lumber support the sides.
The inner pump spring is in the foil trough covered with paint remover. The fresh paint remover is sort of milky but after soaking for a while some of the loosened grime floats to the surface forming brown spots.
After a few hours soaking, a water spray will remove the loosened grime, leaving a spring that, although not looking entire like new, is at least clean enough to handle without getting black hands.
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