How can I make my fiberglass bathtubs white again?

Hi Barbara, there was a thread on here where it was discussed. https://www.hometalk.com/diy/clean/bathroom/q-how-do-i-get-my-fiberglass-tub-white-again-37028427

You can look at it. Or you can check out this post: https://www.hunker.com/12126351/how-to-clean-and-restore-shine-to-a-fiberglass-tub

This post might help. https://www.hometalk.com/diy/bathroom/showers-tubs/fiberglass-tub-makeover-24747737

Fiberglass Tub Makeover

If all else fails....use Easy Off No Fume Oven Cleaner in the BLUE can.

Sometimes they yellow with age from pollutants in the air. To get as clean as possible, you can scrub with Lysol Power BathroomCleaner in the blue spray bottle is great for removing soap scum. Scrub with a power scrubber, magic eraser, or scrub daddy.

Wet & Forget Shower for weekly maintenance to prevent having to scrub in the future.