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I got the majority of the gunk off of the engine/transmission/frame using an angle grinder with a wire brush attachment. Between the flat and cup style brushes, I got into most of the nooks and crannies pretty well. I finished up with Kerosene. It cuts through grease and crud pretty good and isn't as volatile as other petroleum based products.
Ok, you might think I'm nuts, but the guys at the local bottling plant claim hot powerade will clean anything. they bottle it at 185 degrees ( you know for anti bacterial reasons ) and a steady drip of the stuff over a few years will eat through stainless steel. I haven't tried it but they swear it works.
If there is alot of undercoating and/or several layers of paint, you might try heating it up with a heat gun or torch and use a scraper when it softens up....becareful of fumes so do it outside. You can take a flexible 3" or 4" putty knife and bend it to the contour of the fender or panel, this way you get a better scraping pass on the inside and outside of the panel.
Then go with your degeaser and brush. Gel paint strippers work well because they keep the area wet longer and dont run off or evaporate like other types.
Have your choice of "cold drinks" handy for sanity checks!
good luck, Ed
I've had good results with some stuff i picked up at the dollar store called Awesome cleaner. I use it full strength and for tough spots i let it set for a bit and it usually comes off.
I use the same stuff from the 99 cent store. This stuff is really good. My father in law turned me on to it. I've even used it on removing stains from cloth upholstery and carpeting. No odor, easy to use. I do my whole garage floor with this stuff. Got rid of all the expense junk I was buying that didn't work as well.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.