Recommendation of a polishing product to remove coating

[Firas Kweis]

Hi guys recently one of our schneider diopter full+3 coating got damaged we wish to remove all the coating off by polishing it do you guys know a good product that can help remove the coating ?

 

here's an image of the filter

 

https://imgur.com/Dsw3oct

Edited June 28, 2018 by Firas Kweis