New to the forum. I'm 62 years old, have lived in Maine my entire life, and have never seen what I describe following. We live off a paved private road. The road gets plowed during/after snow storms and no salt (or equivalent) is used on the road. We've never used any type of salt/snow melt on our paved driveway, or anywhere on our property. Last winter, and this winter, after I have cleaned off our vehicles with a shop type floor broom, and have snowblowed our walkway/upper driveway, I put them away in our garage. After the remaining snow melts off of them, and the water evaporates, there is a flaky white residue left where the snow melted. It has to be something that binds to the snow flakes as they fall, but I can't for the life of me figure out what it is. Any ideas? Maybe I don't want to know!