Hi Ray,
If you want to clean up your engine bay. Take Cherry Bomb All purpose cleaner or Brown Royal diluted 1:2 and spray down your engine. Let it dwell about a minute or two and use high pressure water and rinse. You can use a air hose and blow out any residual water that is left behind.
Use caution doing this if You have an Optispark distributor.
You can then coat the plastic trim and hoses with a dressing like Aqua Gloss, Presto or Banna Breeze. These dressing are water based and have great resistance to heat.
Therefore keeping everything lubricated and pliable.
Cherry Bomb is a strong but safe cleaner. It will not streak Paint or wheels. Its can be diluted and will not hurt service labels in the engine compartment. Many Car washes and Detail shops buy it in 55 gallon drums. Its just as popular as Brown Royal. Hope this helps.
Joe-Flash Auto Detailing Products