How to Take Off Wallpaper by Dry-Stripping
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Wash the walls with a solution of wallpaper removal solvent.
Use a large sponge or sponge mop and wallpaper removal solvent (following manufacturer’s directions) to wash off any remaining adhesive residue. You can also use a nonphosphate cleaner in water.
You can use an abrasive pad or steel wool to help you remove the adhesive residue on plaster, but use caution on drywall. Avoid overwetting or abrading the cardboard facing on the drywall.
Rinse your sponge often in a separate bucket of water, squeeze it out, and continue rinsing your walls until all the residue and remover solution are gone.