Simple Green & Castrol Superclean damage the alternator brushes....
Been doing it for years but note that I did say to cover your alternator with aluminum foil...... I don't but then again, I don't flood the alternator with cleaner either.
I use tire foam.
Soak the entire engine bay with it, draining the entire can.
Let it sit, and just before it dries out, hose her off.
Works for me
Not bad for 21 years and 150k miles eh?
I have used that before (Eagle One A to Z) and it does a great job of cleaning the rubber and plastic. I found out that I can get into holes and behind things a little easier with the wand on a pump up sprayer. I have a buddy that puts his tire spray into a garden sprayer instead of the mix I use. It works great but it costs a little more than the 50/50 mix I use.
e-tec is right about a slightly warm engine cleaning easier but you do not want to get it hot and then spray your cleaner on it as it dries too quickly and you DO NOT want that to happen with tire foam, Simple Green, Purple Power or any other cleaner. Note that the caustic cleaners (Simple Green and Purple Power) will corrode the aluminum if left on for a long time or left to dry. Just keep it wet until you rinse it off and don't let it sit more than 15 minutes or so. If you need to take longer than that, work in sections and rinse each area as you complete it.
Once you get it clean, keep it clean. It takes just a few minutes (20 or so) to do an "upkeep" cleaning once or twice a year. If you develop an oil leak, fix the leak an clean the engine. If you screw up and dump 1/2 quart of ATF fluid on your transmission while changing it (did that a few weeks ago....) use the wand, clean it and rinse off. It only took a few minutes but it kept it looking nice.
The engine will run cooler, look nicer and MOST IMPORTANT, I like working on a clean engine. Anyone in the family will tell you that I will not work on their car if it is filthy. I hated that when I was in the business and will do if required, but I don't like it. For maintenance work, they clean it before coming over or take it somewhere and pay for it. Everyone in the family now has a clean engine compartment....
