About a week ago, I got my head gasket replaced and during the job my mechanic managed to spill around 4 quarts of oil on my engine and miscellaneous other parts of my car (like on my seats) . So, I've been driving it a lot lately and it's still smoking like a mofo. I need to get this hunk of smoking crap washed but I need some advice cuz I've never washed an engine before. I already know that the engine needs to be cold before I do it but other than that, Im lost. I just want to know if I need to unplug any electrical devices or anything before I begin. I also heard that Simple Green works the best, if there is any rhyme or reason to go with something else then please let me know. Thanks.