Mold at the bottom of the inside would suggest that interior condensation is pooling there.
Cleaning mold from vinyl window frames.
The coloring on vinyl is delicate so don t use anything too harsh that could bleach or further fade the color.
Interior glass temperatures below the dew point.
First kill the mold with bleach and wipe down the whole area to try to get rid of as many spores as possible.
Next identify and treat the root cause.
Mix a few drops of dish detergent with some.
Especially those vinyl windows.
Spray down with vinegar any areas you see that still have visible signs of mold.
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How to safely get rid of mold on window frames step 1.
Dip a sponge or scrub brush into the cleaning solution and thoroughly scrub the window frames to remove any mold.
Then sprinkle a fine layer of baking soda over the entire surface of the window wells ledges and frames.
Put on rubber gloves.
Let the vinegar and baking soda sit for 10 15 minutes.
If you can mix it up in a spray bottle just spray it on there let it sit for a minute and then wash it down that ought to keep it under control and it ll brighten everything back up again too.
Give your window frames a good dousing and allow the mixture to sit for a few minutes.
If the area has a heavy amount of mold use paper towels and dispose of the soiled paper towels in a plastic bag.
This keeps the mold spores from flying up into the air and spreading as you remove them.
After use a clean rag to rub the baking soda into the surfaces of the window wells.
Window condensation is caused by two factors.
Use this mixture to clean mold off the surface of the window frame or glass with clean cloth.
Dampen the moldy window casings with water from a spray bottle.
Fill a bucket with 1 gallon of warm water and add 2 or 3 teaspoons of laundry detergent.
Seal the bag tightly when you finish and dispose of it in the trash.