Remove Old Adhesive: Use a heavy-duty detergent, such as trisodium phosphate (TSP) and a sponge to remove the excess adhesive from the walls. Some areas may restrict trisodium phosphate, so you can use its nonphosphate equivalent. Your hardware store can help you find the right one. Rinse the walls using a clean sponge. Do not wallpaper or paint over the walls until they are completely dry.
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