Shower stall floor

Try Easy Off No Fume Oven Cleaner in the BLUE can. Spray it on, let it foam and sit until it liquefies then rinse. Works on porcelain and fiberglass.

try using liguid soap body oap rather than bar it tends to leave less soap scum. I use barkeepers friend in the liquid form for my shower. vinegar and water may help cut the soap scum

Have you tried the original Dawn, Baking Soda and Hydrogen Pyroxide? make a paste with the Dawn and Baking Soda apply with a stiff brush then cover with HP. Let it sit overnight, then rinse in the morning>

make a pate with baking soda and hydrogen peroxide

try Lysol Power disinfectant toilet bowl cleaner Available at the dollar store.for about a $1 . I know , I know sounds weird but it works . It is sort of a gel so lay down lines of the gel and use a plastic scrunger to smear it around and let sit for about 10 minutes then rinse. I think you might be surprised at how the stains disappear especially if they are hard water mineral stains .

I have tiled shower floor and I use Dawn dish soap and a kitchen sponge to clean away scum. For stains and mildew, I use gel toilet bowl cleaner, like Clorox bowl cleaner with bleach, I just squirt on stains and let sit. Rinse and I'm done.