How do I clean a rusty bathtub?

Bleach will eat porcelain up. When I prep a car to paint I use comet and a red scuff pad to get it super clean.

Here's a post that might help https://www.merrymaids.com/cleaning-tips/diy/remove-rust-stains-from-bathtub/

Go buy yourself a toilet stone. That will remove anything.

I moved!

Liquid rust remover from walmart, in a rust colored bottle. -And maybe some comet or bar keeper's friend.

Here' a post that might help https://chascrazycreations.com/clean-bathroom-natural-products/

Hello, hope these help you out,

1. Use a rust remover. This one is probably pretty obvious, and if you’ve spent any time in your supermarket’s or hardware store’s cleaner aisle, you know that there are several different products on the market that claim to remove rust on contact. It really is true: rust removers usually work great because they immediately oxidize the rust without any scrubbing. All you have to do is rinse it away, and your sink or tub looks sparkling clean. However, many homeowners are hesitant to use commercial rust removers because they contain harsh chemicals that give off terrible fumes and can make you lightheaded. These products can even cause burns on your skin if they’re not handled properly. Plus, many people are looking for a more eco-friendly way to clean their sinks and tubs. If that’s you, you’ll want to try another method.
2. Use Shaw’s Pads. If you don’t mind using a little elbow grease, Shaw’s Pads are an effective, inexpensive, and environmentally friendly way to clean up stains on porcelain and ceramic surfaces. Plumbers swear by these because they work well and don’t leave scratches. If you can’t find them at your local hardware store, you can easily order them online. (https://www.shawspads.com/)
3. Use pumice. An ordinary pumice stone is also a good way to remove rust, especially from porcelain, since it won’t scratch or damage your surface. Simply wet the stone, wet the rusty surface, and then rub the stone lightly over the surface to remove the rust.
4. Use lemon juice and salt. Two pantry staples can work in combination to clean off the rust and make your kitchen or bathroom smell lemony fresh. Make a paste using salt and enough lemon juice (bottled is fine) to get a thick consistency. Apply the paste to the rust, let it sit for 15 or 20 minutes, and then scrub it off with a scrubber sponge.
5. Use baking soda and vinegar. For tougher rust stains, make a paste of two other pantry staples: three parts baking soda and one part vinegar. Apply it to the rusty surface with a scrub sponge, and let it sit for an hour. When you rinse it off, the rust should be gone, though, for more severe stains, you may need to repeat the process.

Remove Rust Stains From Bathtub

https://www.merrymaids.com/cleaning-tips/diy/remove-rust-stains-from-bathtub/

I have several cleaning tutorials that might help you https://chascrazycreations.com/diys/how-tos/cleaning/

with the help of your post i clean my floral studio bath thanks for sharing this great idea

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1. Make a paste using baking soda and a little water. The amount of paste you’ll need will depend on how much of your tub is affected with rust. Start small and make more if it’s necessary.
2. Spread the paste on the areas of your tub that have rust stains.
3. Let this sit overnight.
4. The next morning, gently scrub the paste away with the microfiber cloth.
5. Rinse any remaining baking soda from the tub.
6. Repeat as needed.

Cerama Bryte. Worked magic on my sink.

I moved!

Try WD-40 , let it sit a while before you try to wipe it off. Close the Topilet or Bathroom door at all times to deter cat!

I've had good results on rust and hard water stains using CLR (calcium, lime, rust remover). No idea why the cat is licking that area but just keep the cat out of the bathroom so you don't have to worry about it.

Either repair or replace.

Don't let the cat in the bathroom - Close the dooe at all times!

Vinegar: This all-purpose household cleaner is also great for keeping your faucets and showerheads clean. Pour 3 parts white vinegar and 1 part water into a spray bottle. Generously spray the rust stain with the solution and let it soak so the vinegar can break down the rust and mineral buildup.

Use clr or bartenders friend cleanser. If you want it to be permanent use navel jelly or other rust converter. Rust converters change the surface chemistry to prevent rust from reforming. It will convert it to a black color so you will need white epoxy paint to change it to white. If there are any holes use epoxy putty to fill them in before painting. Before each coating wait for never jelly to dry, then the epoxy putty, then the paint.

I used bar keepers friend and a Mr clean eraser and mine comes off.

Landlord should pay for it to be replaced.