How can I clean a tin shower that has soap scum?

Pumice stone and doesn't scratch the surface

Can do the toilet and sink also. U will b amazed.

We used 3/4 cup dawn dish soap in 1 cup vinegar and heat for 1 minute in microwave. Then spread it all over the shower doors and walls and leave for an hour or so. Turn on the fan as it is strong smelling. Then using water on it, scrub off with a squeegy and clean the glass part with the rubber side after scrubbing. It cleans up in 5 or 10 minutes after soaking this way! It is the easiest way we have ever found.

I'd try Dow scrubbing bubbles and a scrubby.

i USE PURPLE CLEANER--SPRAY ON LET IT SIT FOR A FEW MINUTES. THEN WASH OFF