Next scrub the rest of the tub using a sponge and soapy water.
Cleaning old porcelain bathtubs.
If it sticks to it you do not have a full porcelain tub you have a metal one with a porcelain enamel finish.
Soak a non abrasive sponge in the baking soda ammonia solution and scrub the surface of your porcelain bathtub or sink paying particular attention to stained areas.
Get an old towel shirt or rag and dampen it.
Use a rag or soft sponge to scrub the porcelain and then rinse well with water.
Using this give the inside of the tub a really good wipe down.
Get yourself a nice large bucket 5 gallons and mix in it 2 gallons of water and cups of white vinegar.
Anyone who owns a porcelain tub would tell you that the worst part of having one is cleaning it.
What to use for gentle weekly cleaning look for store bought cleansers that are marked safe for porcelain enamel or make your own by mixing a few tablespoons of dishwashing soap with about a gallon of hot water.
Then let the mixture sit on the stains for 5 minutes before washing it away with hot water and dish soap.
Avoid rubbing the oil on the bottom of the tub because it can be quite slippery.
Stick it to the side of your tub.
After rinsing wipe thoroughly with a clean rag or the baking soda will leave a white film behind.
To clean a porcelain enamel tub start by scrubbing any stains with hydrogen peroxide or equal parts ammonia and baking soda.
Give it a really good mix together.
Add shine to your clean porcelain tub.
The lemon oil also forms a protective coating that helps stop water spots soap scum and minor stains.