64 Boosted Falcon

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Need advice/recommendations for cleaning the undercarriage before applying a product like Eastwood Chassis undercoating. Are there any products that you all have found to work well and recommend?

Thanks and Happy New Year.

i have owned a steam cleaner since 1987-88 as matter of fact just bought my 3rd new one last week. I have stuff I call “Magic Soap” I spray it down with first then hit it with about 1500 psi of pressure around 250 deg. Nothing it will not take off.

I just started another eco swap. This time a 2.7 in a
1966 F100 4x4.