I found some bird dropping etching tonight on my NEW car. It occurs to me the best thing is to always be prepared to remove that stuff as quickly as possible. So this begs the question, what are the best things to carry in the car? Obviously you need to be prepared to remove the stuff without grinding in whatever dirt is already on the paint. And lets assume you can't count on a hose being available, but you can carry bottled water of course.
Ideas?