The brown stain is from a large amount of iron in your water.
For antique or colored porcelain, hydrogen peroxide and oxygen bleach are the most effective household cleaners for tough stains. Line your sink with paper towels, then spray them with hydrogen peroxide until they are thoroughly soaked and clinging to the basin.
Reddish-brown stains: These types of stains are usually caused by dissolved iron in your water. Once this iron is exposed to oxygen, it forms iron oxide, which gives it the reddish-brown color. Iron in your water doesn't just leave stains on your bathroom fixtures; it can also cause “yellowing” of your laundry.
There are a few ways to restore your porcelain tile after you've come across a stain. You can try tackling the spot with some hydrogen peroxide or by using a steam cleaner. For more difficult stains, consider trying diluted muriatic acid, an industrial-strength solution professionals have been using for decades.
For white porcelain only, bleach can be used to remove stains; never use chlorine bleach in colored or vintage porcelain, as it can damage the finish. For both white and colored porcelain, liquid oxygen bleach (such as hydrogen peroxide) is a good alternative.
Many homeowners ask if Magic Erasers® can be used on porcelain or if they will damage ceramic tile. The good news is that they can be safely used on ceramic tiles and porcelain, so you have nothing to worry about if you plan on using them this way.
The bathroom sink, especially a porcelain one, can tend to get quite nasty over time. You see a lot of discoloration around the drain and the overflow hole. Just apply the concentrate solution to both areas, let it sit for a few minutes, then scrub it with a cleaning toothbrush.
Porcelain is a highly durable material for dental restorations, but it is not entirely indestructible. Stains will not penetrate the surface of quality porcelain restorations unless the porcelain has been damaged by: Highly abrasive toothpastes that wear away the outer glaze of the porcelain.
Firing spots are brown or black color defects clearly visible, dark bullet holes on the outside of the porcelain. Please do not confuse them with the dark brown bleeding iron spots which originate in the raw material.
You can safely use vinegar to clean ceramic or porcelain tiles, whether they are glazed or unglazed.
The unsightly brown patches on your tub and your sinks are probably rust, and it's caused by a number of different things. Often, rust is a result of water carried through older, rusty galvanized pipes. If you have hard water, rust can be caused by the residue of iron and minerals left behind on the surface.
Equally combine warm water, ammonia and baking soda into a bucket. For tough stains, first cover them throughout the tub with salt and lemon juice, then allow it to sit for up to 1 hour. Scrub the salt and lemon juice into the stain. Dip a cloth or soft sponge into the bucket and scrub the tub thoroughly.
Pour white vinegar all over the tub. Let the vinegar work on the stains for 15 minutes. Sprinkle baking soda on any stains that are still visible. Use a soft sponge to scrub the stained area.
THE FIX: Hydrogen peroxide
Apply it with a soft sponge to the offending stain. Let the paste dwell on the ceramic or porcelain surface for one or two hours. Scrub down the stain with a stiff-bristle brush.
These bubbles once grinded or popped by the diamond pads because small crevasses or cups in the surface of the tile. When a polished porcelain tile appears to be stained, it is more often the result of these crevasses filling up with liquid or grime rather than the tile being stained.
While porcelain is a highly durable material for dental restorations, it's not entirely indestructible. Many porcelain crowns become stained when the protective glaze that helps the restoration retain its color gets damaged or if the margin of the porcelain becomes exposed in the mouth.
The combination of iron bacteria and the minerals in the water can cause the rust particles to cling to the porcelain or enamel surfaces of bathroom fixtures. Unfortunately, the stains will reappear after cleaning unless the water is filtered or treated with a water-softening system.
Porcelain tiles tend to be harder, more resilient and more stain-resistant than ceramic tiles. They are one of the easiest types of tile to maintain but their surface can eventually be eroded by the regular use of corrosive chemicals such as ammonia, bleach or acids that can also damage the grout and loosen the tiles.
Sinks, Tubs, Porcelain Toilets, and Ceramic Tile
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. Leave this on for about five minutes, letting it soften the mineral deposits.
When the hard, mineral rich water evaporates, a residue is left behind which results in a hard water stain that can show up on glass, porcelain, tile, and even metal surfaces. There are several different ways to eliminate hard water stains without the use of harmful chemicals.
Stains occur due to seepage of moisture through very small (and sometimes invisible to the naked eye) cracks in the glaze, often referred to as crazing, crackles or pinholes in the glaze. The penetrated moisture combined with organic matter (Tea & coffee, oil, fat, food, dust, etc.)
Porcelain Does Not Stain
In fact, porcelain is totally nonporous — just like glass. Pigments simply slide off of it. Therefore, after you and your dentist choose the color for your veneers and they are custom-crafted to your specifications, the porcelain will never change color.
Is Comet safe to use on Corian, Formica, porcelain, fiberglass and stainless steel. Yes. Comet Cleansers, Comet Soft Cleanser and Comet Bathroom Sprays are all safe to use on these surfaces.
IMPORTANT: To avoid damage to porcelain surfaces, do not use soap-filled scouring pads, abrasive cleaners, steelwool pads, gritty washcloths, or abrasive paper towels. Preferred Method: Soap, water, and a soft cloth or sponge are suggested first unless otherwise noted.
Glazed Porcelain: Keeping your glazed porcelain sink in shape couldn't be simpler. Use Soft Scrub with Bleach Cleanser or Soft Scrub with Bleach Cleaner Gel to free your sink of soap scum, dirt, and stains.