Chomp CleanWalls paint prep degreaser & deglosser gallon

This worked well on my white board pain. I did have to use it several times and sand the wall a little. Even then the wall still had a gloss to it, but when I painted over it the paint came out great and there was no difference in appearance compared to the other walls I painted. Time consuming but worth it! I did not buy the other products recommended to use this product, just used a washcloth and scrubbed then rinsed with water.