I use one of those straight razor holders and scrape it off.
Lacquer thinner and a Q-tip
This will have to be sanded off. After the oxidation has been removed the strip should be sealed with a sealer.
sand it
You sweep the floors
to clean off brakes you can use brake clean fr your local automotive store or you can use a fine sand paper all depends on what is on them
Acid Water
rinse in water
you need to wipe the excess stain off the deck with a clean rag. It will never dry and it will float to the top of the sealer
Yes, it is extremely important that you do.
Scrape off what u can with a razor blade. White vinegar should remove what's left.
Knights would clean their chain mail armor in a barrel filled with sand and vinegar. The sand would help scrub off dirt and grime, while the vinegar would help remove rust and disinfect the armor.
Try using Kilz, a great primer and sealer in one. Peel and sand off where it's chipping and fill the space in with Kilz. Make sure the walls and ceiling are clean. You might want to repaint with a paint especially for bathrooms. It won't be very expensive if you look for paint and supplies that are in your budget.