Hot Water If Possible
Hi Gary
Would make one addition to Bobs comment, hot or even warm water will work much better than cold water even with a pressure washer. The difference between 50F water and even 110F water is visible better cleaning.
I have a little 2 1/2 gallon point of use hot water heater in the shop feeding the water for the pressure washer through this make a huge difference in cleaning and degreasing even when set for 110F but it is adjustable but you have to be sure not to exceed the operating temp of your particular pressure washer. With out the pressure washer I crank it up to 160-170F and it will cut the sludge out an engine.
Keep us posted on your progress.
Cheers Phil
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