For more than 40 years we have been professionally carpet cleaning coffee stains out of carpets in the Denver Metro Area. Cleaning coffee, tea and wine stains can be tricky, especially if they have been set for some time. Stains can often come back after successfully being removed. These types of stains are caused by the "Tannins" in the beverages spilled.
A Tannin is a natural vegetable dye that is in many plants. Examples are grape skins, tea leaves and coffee beans. The proteins in these stains can be particularly difficult to extract. Carpet cleaners will use an acid based detergent to clean the stain, these chemical are high in alkalinity "acid" to remove the tannin stains.
If you wish to try to remove the stain yourself you can mix a few ounces of laundry detergent and household WHITE vinegar and warm water to clean the stain. This will generally give you the acidity needed to break down the proteins.
Gently blot the stain without aggressively scrubbing. The vinegar is very alkaline and mixed with the detergent should break down the proteins enough to remove the stain. Once the stain appears to be gone, blot the stain dry with a light colored towel.
If you are concerned about the detergent or acid based liquid in your carpet, you can use a little warm water to was the carpet. Use the light colored towel to blot it dry again. Repeat as much as you feel is necessary.
Usually a light detergent will not harm your carpet.
When the stain comes back
You have removed the "tannin" stain and it returns when the carpet is dry!
This can happen due to residue left behind in the base of the fiber or backing. This residue "wicks" up to the top (the same principle as a wick in an oil lamp) of the fiber as the carpet dries. This is a very common situation, to remove simply re-clean the area with a damp cloth and a very thin mixture described earlier and blot the stain keeping it very dry.
You are attempting to wipe off the top of the carpet only, keeping it as dry as possible (do not saturate or over wet the area), even employ a fan to dry the stain rapidly.
You can also can spray an inhibitor to stop any residue from rising up the fiber. If you have attempted to remove a stain without success please call a professional to remove it for you.
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