I have used purple power many times, and it works great before pressure washing.

If I have a lot or really nasty of stubborn stuff I will take the parts to the local automotive machine shop and put them in the "hot tank" an automated parts washer with a powerful and hot solvent. Often the paint is removed as well as the grease.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-