I thought I might do some engine cleaning after replacing the Aux Fans on my 1992 500E.

There seems to be a number of areas in the engine bay that have a brown/carmel/gold color layer of gunk that almost appears to be a sprayed on coating like an undercoat.
--- It appears to be a clear coat of some kind that turned carmel color.... Hard / brittle - requires physical scraping to remove.
It seems to be overspray on the airbox as well as engine / power steering reservoir.

First round of degreaser did not clean it up, I don't want to use anything too harsh on it. Any suggestions?

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Bryan Harter
1992 500E Smoke Silver
2002 CLK55 AMG Cab Silver/Black
2001 Harley Fatboy - Pearl White
2004 F150 FX4 Silver/Grey
1969 GTO Liberty Blue
1956 F100 Black