Mildew and other stains may result from hard water mineral deposits generated especially with the use of well water with high iron content. The patches may also occur rusty galvanized pipes leaking onto a sink, toilet leaking components oxidized in the back of the toilet bowl or any metal that is left in the sink. These stains can be difficult to remove. If this is a recurring problem and the stain is chronic, it may no longer be any way to remove the stain, which can become etched in the porcelain.
But do not lose hope! You’re a reader Repairs section of About.com home and I’ll make you’re “free spots”.
Most spots are not serious and can be successfully removed if you know how, but regular cleaning toilets or powdered cleansers with chlorine will not solve this problem.
I will show you several options. Some involve mechanical cleaning and using some strong chemicals (so please try to avoid especially if you have a septic system). Let’s take a look at the options you have for removing rust stains from porcelain.
Mechanical removal: cleaners Shaw (ecological approach)
These non-chemical cleaners are safe for septic systems, and operate on an old principle called “elbowsus lubricatus”, which translates from Latin as “elbow grease” (I know, it’s really not this). Anyway, these cleaners have a short handle and a special pad. You wet the pad, scrub vigorously and briefly, and tartar and stains are removed from the porcelain. Then you should throw the chain or clean with water.
You can buy directly from the manufacturer or use your Ebay store. For less than $ 10 dollars, it will be on your way to a life free of stain on the porcelain.
Mechanical removal: pumice (ecological approach)
A stick pumice scrub works well to remove stains from porcelain. I do not recommend it for fiberglass, but to my knowledge any fiberglass baths. With a stick pumice scrubbing Pumie brand as manufactured by United States Pumice Company, just wet the bar and rub it back and forth over the stain. It will create a paste of pumice that help clean and polish the surface, and then simply rinse.
Scouring Cleanser: ZUD (not organic)
Here are three letters you need to know to get rid of rust and
Mineral deposits: Z-U-D.
ZUD (for Reckitt Benckiser, manufacturer of Spray-n-Wash and Brasso) is the 800-pound monster of cleaning powder and is an enemy of the environment (also comes in liquid form). Why does it work so well? Due to its composition, using oxalic acid and a very effective combination of abrasives which consist of finely ground quartz and pumice stone. The combination is powerful.
Although oxalic acid is a natural organic acid is considered a poison. I do not recommend using this product if you have a septic system. Killing bacteria in your septic is not a good idea (note the euphemism …).
To use ZUD just put a jet or spray stains and brushes it using a toilet cleaning brush or plastic pad. Now add more water to the bowl or sink to the stained areas covered by the solution ZUD. Add more ZUD where you can not cover with the solution (as in the top of the cup). After the solution has set for about 60-90 minutes, clean the area with brush or flush the toilet and clean or flush the solution.
Chemical Cleaner: The Works (not organic)
Basically spray it, let it sit and then rinse. However, the product contains about 20% hydrochloric acid so you have to be very careful when using it. Do not use the product if you have a septic system.