Ah…when you start using your natural body wash and your natural shampoo, you start noticing something…soap scum.
One thing about manufactured shampoo & body wash: I have actually not had to wash my tub out in years! Didn’t need to. And I have hard water that creates lime scale and rust. I just kind of ignored the lime scale and rust, as long as there was no “ring around the bathtub.”
Now, to remove bathtub ring & soap scum: Half cup rubbing alcohol, half cup water, a tablespoon white vinegar, shake it up. Squirt it on your scummy surface, then scrub with a nonabrasive nylon scrubby thing. My favorite is a cotton chenille square on one side, nylon mesh scrubby on the other side.
Got rust? Even tiny rust spots on dishes, where you’ve let a metal knife rest on a porcelain bowl? Lemon juice and salt replace your deadly smelly chemical rust-remover products. It doesn’t work immediately; it does work pretty darn well, soaked overnight. I used this in my tub on the rust stains and it worked fairly well — it probably would have worked better if the plug hadn’t let the lemon juice run out right away. Also I soaked my shower curtain in the sink one night, my rusty, hard-water-stained shower curtain, in some hot water, salt and lemon juice, and stirred that all up. The next morning I washed it in the washer and was pretty surprised at all the rust that had been removed.
Salt and lemon juice! Amazing!
And of course there’s baking soda; I’ve used plain baking soda to scrub out my tub for years, whenever it (seldom) needs it.
Also I keep a spray bottle in the bathtub filled with half water, half white vinegar, and after my shower, spray that around the shower walls that get hit with water during my shower.