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I have screwed a new piece of drywall. Now I need to try to apply mud and finally paint. Should I clean, wash the old painted drywall first? If yes, how? It does not stand out in this picture but the old drywall is very dirty.

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  • Unless it is greasy I just sand the area and then get dust free before mud and tape
    – Kris
    Mar 30, 2019 at 2:24

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Clean with TSP. You can use a sponge for the tsp. I've used a big bucket and a bee mop. You just need to be able apply some force while cleaning. In your case that is a small area, a sponge is good.

https://www.homedepot.ca/product/t-s-p--trisodium-phosphate-powder-400-g/1000130976

Paint with primer.

Then tape and mud.

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  • It's typical to mud, tape then prime and paint.
    – brehma
    Mar 29, 2019 at 22:56
  • I have TSP already. Just use a sponge?
    – Alessio Sangalli
    Mar 29, 2019 at 23:42
  • @brehma, yes if the wall is unpainted drywall. If it is a gloss or semi-gloss paint drywall mud can have a hard time bonding. I recommend clean and prime the painted service then mud.
    – Fresh Codemonger
    Mar 30, 2019 at 14:48

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