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Suffot87 t1_ixs5ey5 wrote

I would wash it before you sand it. Removing loose particles and dirt/grime will greatly extend the life of your sandpaper and prevent any of those particles from getting embedded and and messing up your deck.

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Coal_Morgan t1_ixsxuvp wrote

Plus washing it will get into grooves, nicks and notches that sanding won't get into.

The gunk in notches will stain differently or not allow the stain to penetrate.

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