I bought a 2 gallon jug of Purple Power degreaser at Blain's Farm & Fleet to clean up my tractors. I applied it with a pump sprayer and used my 2500 psi pressure washer to clean them up. It worked really good on the old caked on grease. It also attacked the paint on the hood of my 1948 Cub, leaving it a dull red when it used to be glossy. So be careful using products like this!