How to clean an old one piece fiberglass (?) tub/shower?


My house was built in the mid 1980's ... the tub/shower unit is a once piece, seamless unit, and I think it is fiberglass. Originally it was white but, over time, has become discolored and now looks almond!!! Is there a safe and durable way to fix this so it looks white again? I have used EVERY cleaner out there on it that I am aware of ...

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