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."
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DIY Naturally Scented All-Purpose Citrus Vinegar Cleaners Make your own safe, non-toxic, green cleaners scented with citrus, herbs, and spices; great for gifts, too!