I decided to de-grease my car's engine. I had a small oil spill that I think the last person to change my oil did on the side of my engine. I wanted to make sure that it's clean ans not leaking a gasket. I have never done it and just bought some purple stuff too it down to the buggy bath and sprayed it down then power washed it. It did an amazing job and it looks brand new. I went down tonight and did my trucks engine tonight. I wouldn't want to do it all the time since a little bit of dirt and grease is good to watch in case something is leaking. In my case I need it clean to watch now. Anyways it's a simple job and cheap. I would recommend for an engine around 100k.