There is some information on cleaning copper here:
Try Mr Muscle Soap Scum remover and a sponge. Good Luck! Maybe lemon or Vinegar would also work. Try somewhere first.
Hi Katy, the best way to clean any type of copper tub/show is just with a mild dish soap and soft cloth. You have to be very careful about using anything else as any type of abrasive or acid (lemon type product) can damage the copper.
Here is info I found for you- cleaning copper is tricky to say the least.
Here is more info for you and your copper walls
Hi Katy: This site should help you out:
Lysol shower cleaner in the blue trigger spray is great for soap scum. Wet and forget shower works great over time.
A mild detergent and soft cloth.
Hi Katy, try some of these:
Try this DIY soap scum remover recipe: https://livingwellmom.com/soap-scum-remover-shower-cleaner/
Saw on YouTube using very hot water to dissolve soap scum. I have used many different applications and none worked. I tried this technique and it did dissolve the scum. Now I have to figure out how to do it safely without burning myself. Any ideas, let me know.
I would try baking soda and very hot water.
I have this drill brush set: https://amzn.to/336XQWY and it works wonders to scrub bath tubs!!!