I just painted the engine bay today!!
First we hit it with the pressure washer. Once it was dry we scrubbed it really well so it was nice and clean. The previous owner painted it a few years ago black it actually looked pretty decent. We didn't really rough it up or sand it down just sprayed it all black again. My buddy has a paint gun, and he had some extra black paint. I just bought a little paint thinner and taped her up... Not exactly a 100% attention to every little detail here, but I didn't want to pay a shop to do it.
I know it will look a lot better then before
Here are the before pics, the tape and the gun... below is the finished wet product...