Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2013 and prior GM passenger cars and trucks.

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  2013 and Prior GM Passenger Cars and Trucks

Possible causes

• Chemical staining mostly results from acid based cleaners; the stains are frequently milky, black or greenish.

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  Chemical staining in most cases results from acid based cleaners (refer to Figure 1 for an example). These stains are frequently milky, black, or greenish in appearance.

• A second type of staining comes from road chemicals such as calcium chloride used for dust control on unpaved roads, and looks like small pitting.

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  A second type or staining or finish disturbance may result from road chemicals, such as calcium chloride used for dust control of unpaved roads. The staining will look like small pitting (refer to Figure 2).

• A third type results from prolonged exposure to brake dust that penetrates the chrome.

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  A third type of finish disturbance results from prolonged exposure to brake dust and resultant penetration of brake dust through the chrome.

• If the brake material sits on the wheel while exposed to moisture or salt, it corrodes the wheel beneath the chrome and leaves a pit or small blister.

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  If the material is allowed to sit on the wheel while it is exposed to moisture or salt, it will corrode the wheel beneath the chrome leaving a pit or small blister in the chrome.

Repair

1. Remove heavy brake dust build-up with GM Chrome Cleaner and Polish, P/N 1050173 (in Canada 10953013).

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   Heavy brake dust build-up should be removed from wheels by using GM Chrome Cleaner and Polish, P/N 1050173 (in Canada use 10953013).

2. For milky stains from acidic cleaners, after washing and drying apply 3M Chrome and Metal Polish #39527 with a clean terry cloth towel; the staining diminishes as it is applied.

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   Apply 3M Chrome and Metal Polish #39527* with a clean terry cloth towel. As you apply the polish, the staining will be diminished.

Caution

• Do not use cleaning solutions containing hydrofluoric, oxalic and most other acids on chrome wheels or any wheels.

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  Do not use cleaning solutions that contain hydrofluoric, oxalic and most other acids on chrome wheels (or any wheels).

• Any wheel cleaner must be thoroughly rinsed off the wheel with clean, clear water.

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  Whenever any wheel cleaner is used, it must be THOROUGHLY rinsed off of the wheel with clean, clear water.

• Stained wheels are not warrantable; most acid based cleaners permanently stain chrome wheels.

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  Stained wheels are not warrantable. Most acid based cleaners will permanently stain chrome wheels.

• This polish reduces the thickness of the chrome plating and, if used incorrectly or excessively, may remove it altogether, exposing a less bright, brassy coloured sub-layer.

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  THIS PRODUCT WILL REDUCE THE THICKNESS OF THE CHROME PLATING ON THE WHEEL AND IF USED INCORRECTLY OR EXCESSIVELY MAY REMOVE THE CHROME PLATING ALL TOGETHER, EXPOSING A LESS BRIGHT AND BRASSY COLORED SUB-LAYER.

• For spotting from road chemicals the procedure may marginally improve the condition but will not restore the finish or remove the pitting.

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  For wheels that exhibit spotting from road chemicals the above procedure may marginally improve the condition but will not restore the finish or remove the pitting.