The previous owner of this house put drywall up but didn't finish the walls. It looks like the drywall has been there for years and it's quite dirty. My question is: Is there any reason I shouldn't be able to just clean the walls off then tape and mud them up?
Drywall – Applying joint compound over old and dirty drywall
drywalltaping
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Best Answer
You don't even need to clean anything unless the soiling is greasy or would otherwise inhibit bonding. In fact, you risk damaging the unprotected paper surface of the drywall.
I'd do your taping and use a good stain-blocking primer/sealer over it all.