Use a 'Sham-Woof' like in the picture above,.

just soap it up and let the rain rinse it off

Now you guys know how we feel in the midwest.

Rain huh??  I will take pics of my job tomorrow and post em.  We are in the middle of our first winter storm here on the coast of the pacific n.w.  I stood out in it all day today doing case-ons for light poles.  But i'm not complaining as slow as things have been, when there's work good weather or bad i'll be the first one wanting to work.  Gotta pay them bills.

WAX, a little wax and some more wax. I do a putz 36 z in 40 minutes( cab and sides  all the way to hopper). Boom is another story. Drive all over hell in northeastern washington state all winter long and all i have to do is spray it off with the pumps water system at the end of the day and that nasty stuff just beads off and makes brown snow/ ice. I got an orbital buffer and it takes me about 25 minutes now. I used to think... wax a pump, F U. But it actually saves a lot of work. Besides snow and rain, concrete splatters wipe off real easy. 

Try furniture polish. Anything cheap will do. I spray it on the whole truck and especially the tip before a good footing pour. When your done just wipe and go. If you have an oiler it will definetly keep him busy during a pour. WAX ON WAX OFF daniel son.

If you dont use it it wont get dirty and its cheaper