Do you think about this question all the time?; "How can I clean my windshield on the trail?"
How about a portable pressure washer?!
Introducing the portable battery-powered pressure washer.  While out on the trail, simply drop the filter end of the hose into a creek, cooler, or bucket of water and spray the dust, mud, and debris off your windshield. The battery-powered pressure washer can also be used the clean your ride when you get off the trail.
 
Includes the following:
Storage case
Sprayer
Adjustable nozzle
15 ft hose with filter
25V rechargeable battery
Wall charger
 
Manufacturers Link