QUOTE(tracks914 @ Apr 16 2008, 08:45 PM)
First - Castrol Super Clean is the best degreaser you can get off the shelf.
Second - clean it up nice and put it on the shelf.
Third - find yourself a '73 1.7 air cleaner with a paper filter element and install it on your car and never worry about the gunk again.
Fourth - if you wan t it to look original see this thread.
Air Filter Conversionit may sound funny or counterintuitive but i've loosened some pretty stuborn and aged dirt/oil/grease by soaking it with w/d for 24hrs.
+. let it sit and pressure wash it off. it also leaves the origanal paint looking like new (oils soak in i guess). some may cringe but i've done this with great sucess under hood on EVERYthing, paint, rubber, plastic ect... AND it doesn't have the drawbacks that some detailing products have such as too harsh or causing dirt to cling later (pressure or steam clean off of course).
mike