Shower cleaner - just vinegar and Dawn dish soap... worth a try! It says, "powerful cleaning product that will melt soap scum and tub and shower buildup, clean sinks, appliances and just about anything. Just spray it on, scrub, rinse and be amazed. For tough soap scum build-up, spray the mixture on and allow it to sit as long as overnight. Then, scrub and rinse."
This is the BEST cleaner I have ever used. Equal parts soap and I used white vinegar. Spray it on your tub and let sit for about 30 minutes. Just wipe it clean and no scrubbing required.
Tub Cleaner: Vinegar And Dish Soap, No Scrubbing. Heat 1/2 Cups White Vinegar In Microwave For 90 Seconds, Pour Into Spray Bottle. Add 1/2 Cups Blue Dawn Dish Soap. Shake Gently To Mix. Spray On Surface, Let It Sit 1-2 Hours. Just Wipe It Away, Then Rinse With Water. Should Also Take Soap Scum Off Shower Doors.