I have 2 fiberglass tubs that have a lot of calcium and soap scum build-up on them. I have tried CLR, Kaboom, Lime Away and others and nothing seems to clean this off. Do you have any suggestions?
There is not a great way to get rid of calcium on fiberglass and the big problem is when you use abrasive cleaners it etches the slick fiberglass surface. This then causes more to stick to it. Mr Clean magic eraser is great for cleaning but never tried it on calcium.