On the cleaning, there is a consensus that you should not do it with a hot engine. Apparently can mess up some of the important parts (like injectors?).

I simply spray engine cleaner, such as Gunk, on the oily surfaces and apply (using a garden sprayer) warm water and dishwashing detergent to everything else each time I change oil. After waiting awhile, I spray the whole thing down with the hose.

That keeps my engine pretty clean. I also go around after all dries and apply a little light oil or ATF to places where I want things to stay lubricated - like linkages.

Nic
'85 300CD