Diy Cleaning Walls . 1l water and 1/4 cup vinegar or 3. Create a paste of baking soda. How To Wash Walls Homemade Wall Cleaner Recipe Cleaning walls, Diy from www.pinterest.com To do so, mix a half cup of baking soda with about an ounce of water. Before you really get into the grunt work, give your walls a good going over with a duster. We used this mixture to wash the walls.