A-Maz Water Stain Remover was designed to be used safely on glass and fiberglass tubs. There is no gritty pumice or chloride in the product. When using on fiberglass tubs, test an inconspicuous area to ensure that the tub can be cleaned. Certain old tubs are worn past the point of effective cleaning or repair, even when using A-Maz!
Posted by DTEPStore on 10/14/2014 to A-Maz