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How do I get rid of mold on the window soffits?

I moved into my wife's apartment and she has really bad mold on the soffits, she says it's always like this.

The house is brick, first floor, corner room with two windows, 500mm walls on the soffits. Double-glazed windows, profile width of 60 mm.

While I think this:

1 Reinstall the window, thereby updating the joint.

2 Plastic linings or can I leave the plaster?

3 Put a plastic or wooden window sill.

• mold
• windows