I keep a detail bag in the trunk with spray detailer and a spray bottle of water. Once I reach my destination after being on the freeway and getting hit with bugs, I spray the front down with water, including the windshield, and wipe them off with a damp towel. I usually try to finish it off with some spray detailer if I have time and my wife isn't in a hurry, although she is pretty understanding of the pains I go through to keep my vehicles looking good all the time.