Where can I have the anti-glare coating renewed on my Mercedes-Benz C-Class's radio unit?

I have taken off some of the black surface of the car radio antiglare screen in my Mercedes-Benz C-Class by using a contaminated cloth. Any recommended source for replenishing the coating on the antiglare screen?

Asked on 9 November 2013 by MH, Newcastle upon Tyne

Answered by Honest John
www.clusterrepairs.co.uk might be able to help
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