when i worked at a garbage company, every week we aka me the driver, or the driver of what ever truck, had to de grease, and then wash the whole truck bumper to bumper and under the hood, im talking frame axle's engine everything.
we had zep de greaser in a 55 gal drum, pumped it into a lawn pump sprayer, sprayed every thing except the painted cab, then washed it down with a hottsy power washer.
then we had a another can full of commercial powdered soap, yeah you know it, a stick with a brush on the end with soap on everything again. then rinsed with just hose. if done the way the boss wanted, it took an hour to wash it.
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