Just remember to fully rinse then with alcohol or brake cleaner when you're done or the rubber seals
will fail from petrochemical cleaner residue .

I just put a drain pan under neath and wet it down with Gunk engine de-greaser , work it 'round with a stiff bristle bush (solvent brush) and then rise off with aerosol brake cleaner .

-Nate
There is no problem so difficult it cannot be overcome by generous application of brute force & ignorance