Hey guys....i have an appointment to have my headers put on by my local shop....but before i do i'm going to wash out the engine bay area due to the grease and grime left in there....what should i know when i'm pressure washing my engine bay?....i'm going to actually left my car running while i do this cause i don't want it to struggle when i try to start it again....and also i'm going to have my vehicle either left at the shop so that once the shop opens....they'll pull it in their shop to work on it and the engine'll be cooled down....or just towed there (flatbed) in the morning. what else should i know??