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TOGWT
07-18-2011, 02:37 AM
Is an option on current BMW models, offered in matte and glossy finishes, it replaces the chrome around the windows, body panels, bumpers and grille. The glossy black trim pieces are anodized, not painted, and the discoloration does not mean that the surface has been damaged. Exterior trim may become discoloured; this discolouration is due to a film deposited on the trim which distorts the light reflecting off the trim.

These deposits may come from car washes, hard water, or other environmental conditions. Deposits that cause the discoloration can be easily removed by polishing with a quality light finishing polish (Extract from a BMW technical service bulletin (Trade Service Bulletin (TSB)

Note: The glossy black trim pieces are anodized, not painted, and the discoloration does not mean that the surface has been damaged. Therefore, the trim pieces do not need to replaced.
This discoloration could be weathering bloom, chalking, or chemical attack. Weathering bloom may occur when sealing is inadequate, and the surface of the anodized coating has become etched during weathering. Acidic pollutants in the environment promote this effect.

It may be possible to restore the original appearance by an abrasive cleaning using a light abrasive. Coarser abrasives such as sandpaper or steel mesh should be avoided, along with acid or alkaline cleaners, any of which would damage the anodized coating.

After washing surface use Klasse all in one (AIO), for water spots or stubborn stains use with a terry weave towel to increase abrasiveness

Munich77
07-19-2011, 03:17 PM
Great tip - I had forgotten about how versatile KAIO is until I tried it on my shawodline trim with success.