Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2017 and prior GM passenger cars and trucks.

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  2017 and Prior GM Passenger Cars and Trucks

Possible causes

• Chemical staining in most cases 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 can result from road chemicals such as calcium chloride used for dust control on unpaved roads; it 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 of finish disturbance results from prolonged exposure to brake dust and penetration of the brake dust through 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.

Steps to confirm (in the document’s order)

• Wheels damaged by wheel cleaners most often show the damage around and under the wheel weight, where the cleaner was not completely flushed away.

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  Wheels returned to the Warranty Parts Center (WPC) that exhibit damage from wheel cleaners most often have the damage around and under the wheel weight where the cleaner was incompletely flushed away.

Repair

1. Remove heavy brake dust build-up from the wheels with ACDelco Stainless Steel and Chrome Cleaner and Polish, P/N 88864067.

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   Heavy brake dust build-up should be removed from wheels by using ACDelco Stainless Steel and Chrome Cleaner and Polish, P/N 88864067

2. After cleaning, wax the wheel with ACDelco Cleaner Wax, P/N 88865218 (in Canada 2675208), which helps protect the wheel from brake dust and reduces its adhesion.

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   After cleaning, the wheel should be waxed using ACDelco Cleaner Wax, P/N 88865218 (in Canada, use 2675208), which will help protect the wheel from brake dust and reduce adhesion of any brake dust that gets on the wheel surface.

3. Apply 3M Chrome and Metal Polish #39527 with a clean terry cloth towel; the staining diminishes as the polish is applied.

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   3. 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 that contain hydrofluoric, oxalic and most other acids on chrome wheels, or on any wheels.

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

• Whenever any wheel cleaner is used, it 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.

• For spotting from road chemicals the polishing 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.