I need to paint my front porch, but there is a small stain that appears to be oil, grease, or a similar substance. (Water beads on it, despite there being no paint or finish.) Here's the stain in context:

enter image description here

And here is a tight zoom on just the stain itself: enter image description here

How does this affect the prep or the painting?


Mix a box of baking soda or sawdust with mineral spirits or isopropyl alcohol to the consistency of toothpaste and rub it in with a soft brush, leave for an hour and then hose off. Preheating the wood with a hair drier or as if in the sun to allow oil to flow easier , then reapply , If the stain persists repeat.

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