Wiper Smearing and Waxed Glass: Why New Blades May Not Help

Wipers and waxed glass: why new blades don't always cure smearing

Scope: 2026 Qin L DM-i, China mainland; PDF pp. 377–378

The condition of the glass matters too

This car's wiper maintenance notes warn against wiping glass that has oil or wax on it. That reminds us that smearing cannot be judged by the age of the rubber alone; if it is still unclear after new blades are fitted, that doesn't immediately mean the product is fake. Glass care, washer fluid and the wipers should be assessed together by the workshop. ^[1]

Don't experiment by mixing cleaning products

We suggest confirming with the detailer which areas were treated before and what was actually used, then choosing professional treatment that meets this car's requirements rather than trying several solvents in turn. Window film, camera-related areas and ordinary exterior surfaces don't automatically share the same treatment. Before buying wipers, check the product against this car's specification instead of ordering because of smearing. ^[1]

Safe visibility is the line to stop at

If you can't keep a clear view in the rain, stop driving and wait for conditions to improve or get help; don't keep testing on the road. Removal, adjustment or repair of glass should be done by professionals. This article gives no chemical de-waxing recipes, wiper service-position steps or glass repair tutorials; the actual cause and work belong in the job record. ^[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.