How does this "trail wash" system work and what is it? I know my rad gets caked with mud all the time and had it overheat before as well. Something that works that you can take along for the ride would be great. When we're on the trail we use a water bottle with a small hole in the cap so it has lots of pressure when you squeeze it. But by no means is this a "system" LOL

 

Try looking into the portable 12v marine washdown pumps. They are basically a bilge pump that you can carry with you and toss into a source of water.