Salt on the roads

May sound funny, yet it's worked for many years...

Spray to coat the vehicle in sump oil then go blasting down a dirt road to coat it in dust.

Sumo oil : Any of numerous mineral, vegetable, and synthetic substances and animal and vegetable fats that are generally slippery, combustible, viscous, liquid or liquefiable at room temperatures, soluble in various organic solvents such as ether but not in water, and used in a great variety of products, especially lubricants and fuels.

When spring comes, wash it away at a DIY car wash..

I remember getting this done when I lived in Toronto for my 55 Ford P/U