I use straight Simple Green, let it soak and wash it with a medium bristle wand/brush hooked to a garden hose. Works great! I usually let the Simple Green work for about 20-30 minutes. it's cheap and saves elbow grease. Works great on road grime, bugs, etc. Cleans the tires well too! For the front of my trailer and vehicle I apply liberal amounts of Rain-X and it works good as a preventative.
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