If water is leaking from the outside onto the window sill then it s likely that the window frame is damaged and needs repairing or replacing altogether.
Black mould sash windows.
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Anything that the mold has settled and grown on will have to be replaced.
Wood around windows even the interior easily gets damp due to insufficient caulking heavy humidity and rain or condensation that forms naturally on glass.
And if the window reveals are redecorated you may consider mixing in some anti fungicide solution in with the paint before it is applied to the walls to prevent future mould growth.
If the area is humid and condensation is often found on the window frames or sills this can lead to mould.
There are 2 leading contributors to black mould forming around windows or on window sills.
Typically the mold is colored and able to be seen but sometimes the mold can be the same color as the window frame making it very difficult to see.
How to remove black mold on windows written by shermaine williams on apr 09 2010.
How to prevent black mold on windows the type of product that will work for you will also depend on the material the black mold mould is growing on and the environment.
A small amount of discoloration on your windows may be unattractive but is.
Mold inside the wall will be black and webbish looking.
In my opinion and previous experience going through a horrible mold situation you really must replace the wood and check to see if the mold had grown in the dark damp space between the walls.
On most homes mold begins to grow at the bottom of the windows at the joint between the glass and window sash frame.