BMW High Gloss Shadowline - removing rainbow colours

[Origin Unknown]

Just bought a BMW X5 M with the Shadowline roof bars. Seems there was a BMW Technical service about discolouration and rainboe effect.

Technical Service said:

SUBJECT
Discoloration of Shadowline Trim

MODEL
E46 (3 Series), E60, E61 (5 Series), E64 (6 Series), E65, E66 (7 Series), E83 (X3), E53 ( X5) Equipped with Shadowline exterior trim

SITUATION
The optional glossy black Shadowline exterior trim may become discolored.

CAUSE
Analysis has determined that the discoloration 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.

CORRECTION
Deposits that cause the discoloration can be easily removed by polishing with a quality swirl removing polish, such as Meguiars #9.

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 should not be replaced for this complaint.

The above refers to Meguiars #9 but before I shell out, I have some G3 Paint Renovator. Would that be a suitable alternative?

[MrChips]

I would think it's fine. They're recommending a polish as it'll break down the deposits that are causing the light effect so G3 should work in a similar manner.

[Origin Unknown]

Thanks

I'll report back the results