cleaning an old tub
I have been trying to clean the old bathtub in our 1915 house. Based on the other bathtub we removed, I think it is cast iron with porcelain interior. I've tried your basic Comet powder and scrubbing bubbles so far. It removed the surface grime, but not the dried latex paint and rust.
Any suggestions? I looked at CLR and am afraid it might etch the finish away. I've found some of the paint will loosen and scrape away with a rough sponge after soaking in very hot water. It's labor intensive though. The tub is white, so I don't think anything will bleach will damage the color.