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.
The ultimate stain remover that actually works on a seriously set in stain! Never buy oxyclean again! The mixture is 1 tsp. Dawn dishwashing detergent 3-4 tablespoons of hydrogen peroxide couple tablespoons of baking soda. Scrub on with a scrubbing brush :)