Moisture is usually the culprit when it comes to exterior wood damage. Areas that get little or no direct sunlight are particularly vulnerable. The dampness often leads to rotting wood and another nasty nuisance - mildew.
Try this magic formula that’s really going to kill the mildew:
1. Start with 3 quarts of warm water
2. Add 1 quart of liquid laundry bleach.
3. Add 1 quarter cup of any kind of powdered detergent
4. Add ¾ cup of TSP (tri sodium phosphate). You can find it in any paint department or any paint store.
5. Mix all ingredients together.
6. Apply mixture with a scrub brush. Remember to wear eye protection and rubber gloves when applying.
Now we are going to replace the rotting wood:
1. Line up the drip-edge.
2. Loosen the gutter.
3. Pull the rotten fascia board out. Don't throw this out just yet - we'll use it for a pattern for cutting our other wood.
4. Mark your cut line on the new board.
5. Cut at a 45° angle, so the board will line up neatly with what's already up on the house.
6. Put the new board in and see if it fits.
7. Nail it in place.
8. In order to protect the new board, we will paint it. But in order to keep the mildew away, we will either use a primer with mildewcide or add mildewcide to the paint.