Fabuloso mixed at 1 Oz per gallon of water. Great for getting the scum off the tub, cleans everything but glass. It’s cheap as hell.

Vinegar & water for glass cleaner (with a drop of dish soap). Cleans better than store bought.

Occasionally I’ll use a specific toilet bowl cleaner when minerals start building up. I get the bottle that squirts up under the rim because that’s where mineral buildup starts.

But really, just about any light cleaner works for a bathroom, I’ve used everything. Just don’t use abrasives until you know exactly what you have for materials. Many baths are plastics these days, which are easily scratched by abrasives.