Spray with white vinegar every few days, esp. shower curtain.
Works great.

No soap scum. Plus no slimy "ends" of soap or bending over to pick up slippery dropped soap in the shower.

I'll stick with bars and use a ceramic or metal holder that allows drainage.

Same here.

Wondering if there's something stronger than vinegar to zap black mold, not the scary type though

That was when I was in Florida years ago.
Only time I had mold.

Don't know if that's wise.

After the hurricanes they advised victims of flooding to spray bleach on everything. I have had 5 floods in my bottom floor apt (I live in a desert climate but neighbors with leaks combined with gravity makes me the victim) and the company that does the "drying out" always uses bleach. It is great on wood too.

These compounds break up grease and oil. That's why they clean our dishes and pots and pans so well. Emulsifiers are also used to help break up oil spills at sea and on land.

The tub in our New York City apartment is quite old and had a dull, dingy finish. Replacing it was not an option. I found a product called Tough As Tile made by Homax. It comes in a variety of colors and the high gloss white that I used looks spectacular. It requires two coats and takes two full days to cure. One must follow the directions absolutely carefully but the results were worth the effort. I cannot recommend this product highly enough!