Do not use brake clean as it has petroleum products in it . "Oil " lol
Use acetone or something like it.
You can buy clutch cleaning sprays at dealerships as well but acetone is cheaper.
I agree 100%...Pressure washer and a degreaser. I'm lazy. Works well for me. Also cleans all the belt dust from the clutches. I always run it after to try get all the water out. Don't let the water freeze, and don't try to drive with wet clutch faces. Works better if you take the belt off as well.