Black stain from the rain.

Florence asked 6 years ago

Thank you for the great pro information.
Our problem is that the previous owner of the house we just moved in has let one of the outside doors take the rain and there is now black stains on the bottom. I read on a French website (I’m from there…and my Australian husband has got no idea about varnish work), someone talking about using bleach on it! I’m a bit surprised, it there a better way?
Thanks a lot!

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