At the table with the chemicals you want 1 shot of Chitinase, 1 shot of Dismutase and 1 shot of Catalase (1st, 2nd and 4th chemicals) and you'll have your mixture. 2It glows red!" Now look by a yellow toolbox and find the TOWEL. Combine the towel and the chemical. Take the resulting red rag and use it on the dirty painting.