There’s no single right answer, but Chicago’s seasons make a good case for washing more often than you might in a milder climate. Here’s a practical guide by season.
Winter: every 1–2 weeks
Road salt is the big one. It clings to your undercarriage and wheel wells and accelerates rust over time. Through salt season, a wash every week or two — one that includes an undercarriage rinse — is cheap insurance against corrosion.
Spring: every 1–2 weeks
Pollen and tree sap coat everything in spring. Left on the paint, they can etch the clear coat. Regular washing keeps buildup from settling in.
Summer: every 2 weeks
Bugs, tar, and construction dust are the summer villains. Bi-weekly washing keeps them from bonding to the finish in the heat.
Fall: every 2–3 weeks
Leaves and the first road treatments show up. A steady rhythm heading into winter keeps your protectant fresh before the salt returns.
The math on frequency
If you’re washing a couple of times a month or more, a single-wash habit adds up fast. A 30-day Club Plan usually pays for itself in about three washes — and it’s valid at all four Nappa locations, so you can wash on whatever route you’re already driving.