How to Protect Your Car From Minnesota Road Salt This Winter

Updated October 2026.

Every Minnesota driver knows the white crust that shows up on their car by mid-December. That crust is not just ugly. It is salt and brine, and it works on your vehicle all winter long.

Last winter, MnDOT spread 190,758 tons of salt and more than 16 million gallons of salt brine on state roads alone, before counting city and county streets. (MnDOT Winter Maintenance Report) If you drive in Edina, Minneapolis or anywhere in the metro, your car is driving through it.

Here is what salt does to a vehicle, and what you can do about it before the first big snow.

Where salt does the most damage

The underbody. Brake lines, fuel lines, suspension parts, frame rails and floor pans sit right in the spray. Salt holds moisture against bare metal, and that is how rust starts. Damage here is the most expensive, and it can become a safety issue.

Hidden cavities. The inside of doors, rocker panels and box sections collect salty slush that never fully dries. Rust often starts from the inside and shows up on the outside only once it is too late.

Paint, wheels and trim. Salt film dulls paint, stains plastic trim and builds up on wheels and brake calipers. Rock chips from sanded roads open the door for rust on the front of the car.

Step 1: Protect the underbody

This is the most important step for any vehicle you plan to keep through more than one Minnesota winter. Pristine Detail offers three options:

• IGL Aegis Underbody Coating: a clear, graphene-reinforced anti-corrosion coating for the frame, floor pans and suspension. Because it is clear, you can still see the metal and catch any problem early. Black, tar-style undercoating can hide rust until it is too late.
• Waxoyl Rustproofing: a flexible, self-healing wax that creeps into seams and hollow cavities and pushes out moisture. It covers places a spray coating can't reach, like inside doors, rocker panels and frame rails.
• Complete Rust Protection: both treatments together. This is our most complete option, and the one we recommend for new vehicles and trucks.

Underbody protection works best on a new or clean vehicle, before rust takes hold. See all options on our undercoating page.

Step 2: Protect the paint

A ceramic coating makes salt, slush and road grime much easier to wash off, because it doesn't stick to the paint the way it does on bare clear coat. It also helps protect wheels and trim when those are coated too. See our Ceramic Pro coatings and XPEL ceramic coatings.

For the front of the car, where sand and rock chips hit hardest, paint protection film is a physical barrier. A coating can't stop a rock chip. PPF can.

Step 3: Wash smart all winter

• Wash every week while roads are salty, and as soon as you can after a storm.
• Choose washes that clean the underbody. Rinsing the paint alone leaves salt where it does the most damage.
• Wash on warmer days when you can, so water doesn't freeze in door jambs and locks.
• Skip brush washes on coated or filmed cars. Touchless or hand washing is gentler.

When to do it

The best time is now, before the roads are white. Coatings and underbody treatments need a clean, dry surface to bond, and that's much easier to get in the fall than in January.

Winter Special (Nov 1 – Feb 28): get free Glass Protection ($299.99 value) with Complete Rust Protection, any PPF package, Essential ceramic or Ceramic Pro Bronze. Or get free Wheel & Caliper Protection ($399.99 value) with Premium, Ultimate or Ceramic Pro Gold. See the Winter Special.

Get a free quote: call (651) 706-9895 or request a quote online. Pristine Detail is at 4444 W 76th St in Edina, serving Edina, Eden Prairie, Minneapolis, Bloomington and the southwest metro.