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The other day quite by accident I came across this easy way to get coffee stains out of my cups. Normally I use baking soda and rub the stains out, but it was all gone. The cups also had some lime deposits on them so I thought I'd use vinegar to remove those and found I only had apple cider vinegar. I didn't want to cool my dish water so I heated a cup of apple cider vinegar in the microwave for 2 minutes. I then added it to my dish water and let the cups sit a few minutes and the coffee stains wiped right out with no scrubbing.
I have trouble with my coffee cups and mugs becoming discolored because my husband drinks lots of coffee. All I have to do to take out the stains is to let them soak in a a sink full of water with a about 1/4 cup bleach added. Just be sure to rinse them well. Works great!
Coffee stains on the inside of the rim of your coffee cups? Turn them upside down in 1/2 inch of half and half white vinegar and water for at least 30 minutes and then wash as usual.
By Charlie from San Antonio, TX
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My wife and I are regular coffee drinkers. We perk a pot almost every day. If we don't drink all of the pot, we may reheat it in the microwave later. Some of our white painted coffee cups have started to discolor (primarily on the outside). Is the paint disappearing with repeated microwave and dishwasher action? We would appreciate the feedback.
This could easily be just a coffee stain on your mug.
Use a sponge or soft scrubbing pad with baking soda to clean the outside of the mug.
Mix your baking soda with a few drops of water to make your paste.
Apply the baking soda and water mixture to the outside of the mug. Rub it gently to cover the surface.
Let sit for 30 minutes and use a soft scrubbing pad to finish cleaning the mug.
This should remove the yellow or discoloring stains from the outside of the mug.
It could be from high water temperatures and high drying temperatures. Try to lower the temperature when washing and drying.
Probably most of us do exactly the same thing but I believe you will find cups are not made of the same materials and some may discolor faster than others.
Just a word of caution: bleach will remove the "coating" on most things and that in turn makes the cup (or whatever) absorb more of the liquid and that many times stains even faster and gets more and more difficult to remove.
Stain Removal For Ceramics
Following are some things that I have used with success.
Be sure to rinse any method well and even wash normally after any attempt at stain removal to remove any residue.
Soak in bleach.
Fill up your sink add 1/2 cup of bleach soak 1 hour.
Wash each cup with a scrub pad.