Corningware quart has stain on the interior bottom what do I use to remove stain

You would have to determine what the stain is before an accurate answer on how to deal with it. Can you add a picture?

The original pot should be a 3 quart white Corningware A-3-B with a clear Pyrex A-9-C lid. The modern equivalent in a 3 litre pot, both are available in the USA where they are made. Search 'Corningware A-3-B' for what's available.

Hello -

The cause of the stains on the interior of your dishwasher may be the water. Do you know if you have hard water, water with a high mineral content? If so, do you know if the water has a high iron or maganese content?

If you have hard water in your home water supply and do not have a water softener, check the owner's manual for your dishwasher - the Troubleshooting section - to see if there is mention of stains on the interior of the dishwasher.

+++
From the American Cleaning Institute web page on Automatic Dishwashers:
http://www.cleaninginstitute.org/clean_living/automatic_dishwashing_problems.aspx#Yellow
Yellow / Brown Stains

Causes:
Iron or manganese content in water supply.

Solutions:
After food soil is removed, wash dishes with citric acid crystals. Check dishwasher manufacturer's instructions for amount to use and method. Do not add detergent.

A liquid product is available to remove iron deposits from the dishwasher interior; follow the package instructions.

To retard staining, use maximum amount of dishwasher detergent to keep iron or manganese in suspension during the wash. Use a rinse additive during the rinse.

Preventative Measures:
If staining cannot be controlled, the only solution is in the installation of iron removal equipment in the home water supply.
+++

Some solutions to the interior staining problem recommend the addition of citric acid crytals to the covered section of the dishwasher detergent dispenser. If you do that, be sure you do not have any sterling silver or silver plate tableware in the dishwasher. (Those items are best washed by hand, anyway.) Citric acid will cause pits on sterling silver and silver plate. Note: Some dishwasher detergents and dish liquids have citric acid in their formulations - check the ingredients.

Best wishes.

Does it appear that the enamel is worn away and the stain is embedded into the underlying ceramic?

If not, here's a crazy thought for a solution that just might work: Oxiclean. It's safe to put in your dishwasher, and it certainly does a stellar job of getting stains out of practically anything. It works best in warm to hot (but not boiling water), so a scoop in a crock pot full of water set to low for an hour or two may just do the trick. If not, I doubt anything will. Be sure to rinse it thoroughly after cleaning. If you've used Oxiclean before, you know how slick the residue can be.

Hope this helps!

I actually have a 'new in box' Corningware 6Qt Programmable Slow Cooker. If you'd be interested in purchasing .... I'd be willing to sell for $25 plus shipping. Please let me know.

soak it in bleach water and use a sos pad on it ,.....good as new!

Any easy way to remove those stains is to use denture-cleaning tablets. Fill/soak the piece of equipment in hot water and throw in a couple of denture cleaning tablets and leave overnight. Rinse out and wipe the next morning and it should be clean

Dishwashers are prone to mold and mildew this time of year. Clean all of the orange stains with a solution of one cup of clorox bleach in two quarts of water. Then run the dishwasher on its hottest and longest cycle adding only two cups of vinegar through the door opening. That will clean up the entire insides and remove the clorox smell.

Cleaning the Interior of the Machine If the interior of the machine becomes dirty, paper printed onto by the machine may get dirty, so we recommend performing
cleaning regularly.
Note: Ensure that the Inner Cover is closed.
1. Press <ON/OFF> to turn on the machine, then remove any paper from the Auto Sheet Feeder.
2.Press the Open button to open the Paper Output Tray, and open up andset the extension by pressing down the hollow on the front side.
3.Prepare a single sheet of A4- or Letter-sized plain paper. Fold it inhalf along the long edge. Unfold the paper, then load it in the AutoSheet Feeder with the open side to the front.
4. Start bottom plate cleaning.

1. Press <COPY>.
   
2. Press <Menu> repeatedly to select [4.MAINTENANCE].
   
3. Use [ ] or [ ] to select [BOTTOM CLEANING], then press <OK>. The sheet of paper is automatically fed in and then out of the machine.

Ifthe printed paper is smudged, clean the inside of the machine again. Ifthe problem remains after performing cleaning again, the protrusionsinside the machine may be stained. Clean them up.
Note:Even if the Cassette is selected as the paper source, paper will be fedfrom the Auto Sheet Feeder. Do not perform any other operation whilethe bottom plate is being cleaned.
Cleaning the Protrusions inside the Machine

If protrusions inside the machine are stained, wipe ink off the protrusions using a swab or the like.


I hope it helps!!!