I just bought an '85 Mustang GT 5.0 with the 302 HO Alum block, Holly 4-barrel and a 5-speed. It has a leak I am trying to pin-point, plus it is just generally dirty, so I need to seriously clean this engine bay. Main concerns are: I have never worked in a bay this old, all the rest I have worked on are from 2010 and newer. What are my concerns here? I will likely only use my fire-hose, and not PW, and I know to cover the distributor and all, but anything else? Also, i remember hearing that Simple Green is really bad for Aluminum, does anybody know 100% for sure if Zep Citrus or Purple are safe on aluminum blocks? If not, what product should I look into buying? Thanks!