First, I wipe down my shower after every use with a towel. That keeps the fiber glass shower clean so I only have lightly clean the shower a couple of times a year. I use Bar Keepers Friend that I bought at Home Depot with a non scratch pad available at grocery stores. My preferred brand is made by 3M Co. My fiber glass shower looks as good as the day it was installed and by wiping down the shower after every use it is very easy to keep clean in the minimum of time.
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