Tea tree oil is the best treatment for killing and tackling mold on window sills unfortunately it is the most expensive option too.
Cleaning black mold from window sills.
Wet a toothbrush with the cleaning solution of your choice.
However it can penetrate into the roots of the mold and can kill and remove all traces of mold.
Protect wood by wiping away condensation on panes.
Fill a spray bottle with white vinegar.
Dampen a clean cloth in cool water.
Scrub the black spots and then spray generously again.
Vinegar and ammonia can substitute for bleach if necessary.
Keep your windowsills as dry as possible to help prevent mold.
Put on gloves a face mask and safety goggles.
Scrub the area with some elbow grease to break up the mold particles.
How to remove black mildew from wood window sills step 1.
Add caulk to the window edges to stop leaks and wipe away.
Alternatively mix 1 cup oxygen bleach with 1 gallon of water and pour.
Spray the mildewed window sill with the mixture and let sit for 10 minutes.
To prevent the mold spores from entering the air dampen the affected area with a spray bottle.
Once the mold has been scrubbed use a damp microfiber cloth to wipe the surface clean.
Let the vinegar sit for an hour before rinsing.
This is just one property of tee tree oil and is something you should have on hand at all times.
Vinegar is a good option in cleaning black mould from these areas.
Clean sills regularly and check for any signs of mold.
Pay extra attention to windows in damp rooms like the bath and laundry.
Place undiluted white vinegar in a spray bottle and spray the sills and frames.