Is the boat cover or tent still dirty after cleaning with Sprayhood & Tent Shampoo? Then use Power Cleaner as an extra strong cleaner.
Because you have first cleaned with Sprayhood & Tent Shampoo, the Power Cleaner only has to soak into the grime and stains that cannot be removed in the normal way. Feel free to allow the Power Cleaner to soak in for a long time.