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.
I use 1 cup of vinegar and 1/2 cup of Dawn dishwashing liquid. Heat vinegar to almost a boil. Pour into a squirt bottle (empty dishwashing bottle) add Dawn and gentle mix without the lid on. Apply to shower/tub. I usually let it sit for a few minutes then wipe and rinse. You will no believe how much soap scum was there. Your shower will look brand new, even the glass doors!
washing pillows - should do TWICE A YEAR! (+ how to make yellow pillows white again...Martha Stewart)