A few ways

https://www.hometalk.com/29325620/5-ways-to-clean-your-tub-tile

https://www.hometalk.com/30240096/the-product-i-use-to-clean-my-bathtub

5 Ways to Clean Your Tub & Tile

The Product I Use to Clean My Bathtub

I found this. Hope this helps! https://www.pinterest.com/pin/35606653287888799/

Mix dawn dish soap and vinegar 50/50. Spray on and let it sit..it works miracles

If it is really filthy I use Easy Off Oven Cleaner in the blue can. If the crud isn't only sort of crudy I use a mix of vinegar and Dawn dish soap. Mix them together in a spray bottle. Either way you choose you would best off closing the door after you apply and come back in about 30 minutes.

https://www.hunker.com/13420724/how-to-clean-showers-with-easy-off-oven-cleaner

Hello Kay,

I always use Washing Up Liquid and a sponge to clean mine. If you have inherited a Scum line, then use a non scratch cleaner Maybe Grunge cleaner. Bet Of luck!

soft scrub works great! It won't scratch like some of the other powder cleaners may.

Here's a post on how I do it - https://chascrazycreations.com/clean-bathroom-natural-products/

Here's what I use:

Fill a spray bottle with a 50/50 solution of Dawn dish soap and vinegar. Spray it on the tub and let it work. If they are tough stains, you may have to scrub with a plastic scrubber!

My favorite thing is "wet & forget shower". It is a solution you spray once a week and it will clean and keep your tub, surround, even glass doors perfectly clean. It isn't a DIY but it's well worth it to me.

If they are really dirty or stained, just scrub with Comet cleanser. Wet the floor and let the cleanser sit for a while to bleach any old stains. Use a brush or Scrub Daddy sponge to rub then rinse.

This should do the trick: https://www.youtube.com/watch?v=_8qeGsaAvi8&t=8s

I use a 32 oz empty water bottle, add 5-6 oz blue dawn dish soap, fill with vinegar. Give it a mix. cut small slits on the top or poke holes, squirt onto the fiberglass tub/shower and let it set for 15 or so min. Take a new soft bristle broom from Dollar Tree (blue bristles) and scrub the tub, rinse with clean water. Repeat as needed.

This information may help you:

https://lancaster.unl.edu/home/articles/2009/fiberglassclean.shtml

Fiberglass is a commonly used material for bathtubs. While it is easy to clean, it can be scratched using the wrong tools and supplies. Combine 2 parts vinegar and 1 part water in a spray bottle and spray the entire bathtub. Allow this soaking solution to sit in the tub for 15-20 minutes.

I have one too and nothing works better than a Mr. Clean Magic Eraser!

Gel Gloss is the best.... https://www.walmart.com/search/?query=gel%20gloss%20cleaner%20and%20polish&typeahead=Gel%20Gloss

Love this stuff https://amzn.to/2IkSPCR