Make a bathtub cleaner paste of one part hydrogen peroxide to two parts baking soda (or cream of tartar). Rub the paste on the stain and let stand for 30 minutes to one hour, then wipe and rinse. If necessary, repeat until the stain is gone.
Combine two parts vinegar and one part water in a spray bottle and spray the entire bathtub. Allow this soaking solution to sit in the tub for 15 to 20 minutes. For tough stains: place a towel soaked in a vinegar and baking soda paste or hydrogen peroxide onto the stain(s) and allow the towel to sit for up to one hour.
Fill a spray bottle with vinegar. Apply the vinegar liberally over the stained area. Wait about 20 minutes, then wipe away the stain with a sponge. Rinse with warm water.
A. Household bleach is an alkaline material and consequently will precipitate iron out of water. It sounds like that's what happened since iron stains are rust colored. A mildly acidic household product made for removal of iron stains should take care of it.
WD-40 is great for quieting squeaks and greasing doors. However, it can also be an excellent bathroom cleaner.
Sinks, Tubs, Porcelain Toilets, and Ceramic Tile
First, scrub as much scum off as possible and then wipe it dry with a towel. After this is done, combine two parts baking soda with one part vinegar to make a paste. Using this, rub it onto all of the surfaces affected by the calcium buildup.
If you have a porcelain tub, pour a little bit of Ajax or Comet directly onto the bathtub stain (enough to cover it completely). Add a little bit of water and scrub using the abrasive side of a sponge. If you rinse the affected area and you still see a stain, use a pumice stone to lift the remainder of the stain.
Baking soda is mildly abrasive and it can be used to polish small scratches in fiberglass or porcelain bathtubs. To use it, combine enough water with baking soda to make a thick paste. Rub the paste into the bathtub to remove the scratches. Rinse the bathtub with clean water when you are finished.
Back to the question, “can bleach damage a bathtub?” Yes, it can. Bleach can add stains to your bathtub is misused. Remember, it is a massive chemical that, if not used correctly, can cause more harm than good.
It's not advised to leave bleach in a bathtub overnight, as it is too harsh of a chemical and can potentially damage your bathtub. Simply leave it on for 6-10 minutes, then rinse.
In order to clean your enamel bath a mixture of water and white vinegar will be sufficient. If there are tougher stains sprinkle a little baking soda followed by the vinegar and water solution. After applying the solution, leave to settle for a few minutes then wipe with a soft cloth to reveal the gleam.
Remove limescale stains with WD-40® Multi-Use Product
WD-40 Multi-Use Product is the ultimate go-to against stubborn stains! Indeed, one of its main functions is to eliminate residues, so it adapts very well to limescale stains.
There are many different types of plastic, but there are two kinds that you should avoid using WD-40 on—polycarbonate and clear polystyrene plastic. Polycarbonate is a transparent plastic that is commonly used in greenhouses, and polystyrene is typically used for styrofoam and soft drink lids among other items.
Baking Soda
This method is important because you don't want to accidentally mix bleach with another product as you try to fix the white spot! Baking soda, sodium thiosulfate, and hydrogen peroxide all work in different ways to neutralize the bleach.
Using Peroxide to Clean Yellowed Plastic
Pour straight peroxide in a container. Put the plastic in the container. Allow the plastic to soak in the sunlight until the stain lifts. Rinse and dry.
Baking soda
One of the best ways to remove yellowed plastic is by using a baking soda paste. Create a baking soda paste and apply it to the yellowed plastic. Mix water and baking soda in a cup or similar container until the solution forms a paste, then apply it to the plastic and let it sit for several hours.
Sprinkle baking soda on all tub surfaces. For extra-dirty tubs, use tub-and-tile cleaner instead. Fill your bucket with a half-gallon of hot water and two tablespoons of dish soap. Dip a scrub sponge or a stiff nylon brush into the bucket, and scrub all bathtub surfaces.
Do not use these cleaners
Chemicals we do not recommend using to clean acrylic showers/tubs: Solvents (turpentine, lacquer thinner, mineral spirits, paint thinner, MEK, xylene, acetone, naphtha, etc.)
You can take a bath after cleaning the tub with bleach. However, it's highly recommended to rinse the tub once or twice before stepping inside. This will ensure the surface isn't slick and/or difficult to stand on. Most people will wait a few hours, rinse the tub, and then let it dry before taking a shower.
Apply Extra Cut Rubbing Compound
Extra Cut Rubbing Compound is used to restore dull, old, and oxidized paint and helps remove sanding scratches. Using a rag, apply the rubbing compound directly to the rag and then rub onto the tub using a circular motion. Continue to apply until you see a shine appear.
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. Dip the sponge in the solution, scrub and repeat until you're satisfied. Rinse well.