Answer for How well do I need to clean dark areas on a new, but aged 4 months, T-111 siding on an exterior shed before painting?

You should use a pressure washer to remove the embedded dirt. You don't need to totally strip the siding just get the dirt out. This wouldn't take much time, no more than a hour. After the siding has dried then use a good primer. Make sure to prime all of the siding before painting.

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