Well, the farm tractor (4110) has been negelcted this year and the lawn was cut when whomever had time, wet or dry. I have it scraped the deck down but there is still a thin layer of grass everywhere under it. Its not easy to scrape and it seems to do more harm than good by scratching the metal. I plan to paint the bottom once I get it clean. Any suggestions? I was thinking hot water and simple green?