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How should I remove wood mildew?

Before leaving the factory, all VELUX roof windows and sky- lights are treated with a temporary water-based fungicide and bactericide. After installation they should be given further coats of a good quality paint or wood varnish at regular intervals. If, however, condensation has been a problem, some discoloration or mold growth may have occurred and although the strength of the timber is unaffected, the result can be
unsightly.

Removing wood mildew

  1. The mold must be killed using a sterilizing agent. Scrape off any surface
    mold, then clean the area with a solution of 1 part household bleach
    diluted in 10 parts water.
  2. Rinse well with clean water. When thoroughly dry, rub down wood with
    medium sandpaper. Repeat steps 1 and 2 until mold is removed.
  3. Finally, coat with a proprietary clear wood preservative and then finish
    with paint or wood finish as desired.