Sponge, hot water, and a broad (6") paint spatula. 1. If necessary, soften the paste underneath the paper with a sponge and hot water. 2. Scrape the paper off with a six-inch broad knife and remove as much of the residue as possible. 3. Rinse the walls with TSP or with a neutralizing solution of 1 cup white vinegar mixed in 1 gallon of water. 😉