How to clean acrylic shower without damaging finish?

I use wet & forget shower on mine. Once a week to clean & keep clean. It's a no scrub product that has worked very well for me.

You could try some of these tips. https://www.wikihow.com/Clean-an-Acrylic-Shower

Easy Off oven cleaner in the blue can. Spray it on, let it sit about 30 minutes (with exhaust fan on and the door closed), scrub with a plastic broom or other scrubber, rinse and you are done. It doesn't hurt the finish. I use it on my fiberglass shower/bathtub combo and it works great.

Use Scrubbing Bubbles or vinegar, baking soda and water with a sponge. Allow some soaking time, finish your sponge scrubbing, and rinse several times. Clean and shiny!