Brake cleaner evaporates fast, have used quick start (ether) which also works well (but dangerous and makes a person dizzy). Brake cleaner seems to move the thick oil out of there quick. As opossed to other solvents, which often don´t work nearly as well. Problem with solvents, they are usually flammable, poison or don´t work well. Benzine, will give you cancer, carbon tet vapors are poison, petrolium distilates both cancer and poisones vapors, flourocarbons discontinued. Gas or ether explosive, when in a vapor or atomized. Kind of narrows the choices down some. Diesel doesn´t move thick oil very well.
Any other options?