How to Get Rid of Black stains on an Exterior Door

In the October, 2017 issue of Popular Woodworking, page 10, I answered a question from a reader concerning how to handle paint on an exterior door that was beginning to lift at the cross-grain joints where water was able to get in and work its way underneath. This inspired another reader to ask how to remove black stains on his clear-finished exterior door (at least one coat of polyurethane) and […]

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