Coastal Driving Corrosion Care: Watch for Damp Inside Too

Corrosion care for coastal driving: damp inside the car matters too

Scope: 2026 Qin L DM-i, China mainland; PDF pp. 361–363

Corrosion protection isn't just about the paint

The manual discusses salt, moisture and paint damage, and reminds owners to watch for water building up under the carpets. A clean body outside doesn't prove that long-term damp inside has been dealt with. If you find persistent damp marks or a smell, tell the workshop about where you use the car and any water ingress, and don't assume it's only a cleaning problem. ^[1]

Find the source before valeting

We suggest giving the workshop the location of the damp, the weather, and any recent car washes or items carried, and asking it to confirm the source and the affected area first. Don't accept only fragrance, drying or whole-car spray treatments before the cause is found. Water and corrosion near electrical components should be assessed by professionals; don't remove trim panels yourself to look. ^[1]

Keep a record of the actual work

Record what cleaning, repair and professional inspection each achieved, and keep working on it if there is still damp or a safety warning. A history of driving through water shouldn't be forgotten just because things look dry; if there is a clear electrical fault, stop using the car and get help. This article gives no underbody washing, corrosion chemical treatment or wiring repair steps, and does not promise any anti-corrosion product will work. ^[1]

Sources

[Source 1] BYD China official website: 2026 Qin L DM-i Owner's Manual (in Chinese) (public PDF on the official website)
https://www.byd.com/material/domestic-official/user-manual/dynasty/2026%E6%AC%BE%E7%A7%A6L%20DM-i%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C20260417.pdf
Verified: 2026-10-03; page publication date not confirmed.

This article contains information-organising suggestions from the editorial team; it is not a manufacturer repair procedure.