Best products and process to polish piano black KEF speakers

Hello,

seeking advice on best products and process to restore light scratches on my R3 speakers after being repaired for corner damage.

While the company did a decent job a repairing damage to the speaker, they somehow managed to create another problem by scratching to top and sides of the speaker.

when I compare it to the good speaker it is a night and day difference. Are there good products to bring back the luster and correct the scratches?

I would appreciate any help with this issue.

Rob