This will help take up any excess grease and also rinse the TSP. It was easy as that. You don't need to use a trisodium phosphate cleaner (TSP) to effectively clean your home's interior painted walls. Use a mixture of lukewarm water and mild soap, gently rubbing in a circular motion. I tried this once and it really paid off! TSP was commonly used prior to the 1970’s to clean walls prior to painting them. Apply it full strength, scrub and rinse away mildew stains. I heard that TSP is good to clean off walls before painting, now I read in a post that you must "flood rinse" TSP off walls before painting. Some of these cleaners don't require any rinsing. My next step is going to be to sand the cabinets before painting. Step 7. Scrub thoroughly to remove all residue. However, many people use TSP for cleaning before using deglosser. How to Clean Cement Floors for Epoxy Paints. Chomp Painted Wall Cleaner Removes Heavy Smoke Stains On how to use tsp before painting, prepare the walls for painting by repairing all cracks, and ensuring sand or smooth the surface walls. 2. Use a good water-based primer on new drywall. This product comes in a 32 oz spray bottle, and since it is a spray-on, wipe-off formula it's great for smaller jobs. Ughh… If only I learned the basics of TSP preparation! Clean with TSP before painting. You can use liquid dish soap such as Dawn, Simple Green, M1 liquid deglosser, TSP, or you can use a product called Krud Kutter. Lay down some drop cloths and tape off the surfaces nearby wood trim, baseboards, and ceiling. Savogran Liquid TSP Substitute. Instead of sanding, Chris and Lexi use mineral spirits