`Cement truck brake corrosion and fatality`
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It turns out the best thing to clean off the trucks is actually hydrochloric acid, muriatic acid, because it will dissolve all these basic minerals. A good strong acid will dissolve away the things. I've had cement trucks that had problems because they started squirting the muriatic acid on the brake system, and it sort of corrodes the steel. One guy had no brakes and he goes over a bridge and kills himself in a cement truck. That's another story.