HI, all new to this forumn and new to the business really. I worked for a company and cleaned Wendys hamburg chain and the hood, and most of them were painted. As you can expect would add the chemical and it would blister up and paint would come off and then they would repaint or just leave it. What is the best way to clean them? I am going to get the training and be responsible, but so much to learn. I found a site that you can be certifed for 550, they give you a manual you take the test and you become certified.