Bird Bath Cleaner: Keeps your water feature free of the mineral deposits and organic residue that tend to build up in bird baths and ponds, lowering their water quality. This cleaner is made with beneficial bacteria and enzymes. Handy disposable dispenser floats in the bowl, treating water continually for up to 30 days.
Charlies Soap Biodegradable Natural Kitchen and Bath Cleaner, 32 Ounce -- 6 per case.
I tried this and the soap scum came right off. I'm completely impressed and no coughing from all the chemicals in cleaners. Never buying shower cleaner again. 1 cup each - warm white vinegar (microwave 2 min) + 1c Original Dawn. Spray, leave for 15 min, rinse.