What’s the best way to clean water repellent fabric on patio furniture?

I wet then spray mine with one of three things, allow to sit 5 minutes, then scrub with a nail brush or shower exfoliating glove and then rinse. Comes out very cleanly. Sometimes, i spot clean with a mr.clean magic eraser though.
All of these can be found in the automotive department
Simple Green
Krud Kutter
Castrol Purple Degreaser