What do you use to clean bathtubs and shower doors that's not abrasive

White vinager

i use vinegar with dish soap added in a repurposed spray bottle. Windex actually worked real well because of the ammonia. Also afterwards you can polish with furniture polish (just don’t do the bottom) to help it stay clean longer.

white vinegar and water 50/50 a dab of blue dawn dish soap and a dab of jet dry

I like Kaboom spray.

Vinegar straight.

Mix one part dawn liquid dish soap and one part white vinegar. Mix together and spray on the surface. Let sit a couple of minutes, then scrub or wipe to remove soap scum, dirt, etc. Rinse well.

Mr Clean Eraser

Toilet bowl gel with bleach, the kind that sticks to the bowl as you squirt it. Take a soft cloth to spread it all over the area you are cleaning. Let it sit for at least 20 mins. Then with fairly hot water spray it down. Amazing!

There surely are sprays out there that will clean as well as an abrasive cleaner. My cleaning lady uses Clorox liquid for my fiberglass tub and tub surround, and they look good to me.