Cleaning brass buckle and keeper

[epiphanist1248]

I'm repairing/replacing a watch band for a family friend. I want to use the original hardware, but it's not in great shape. It's cheap brass-plated and it has some kind of ... gunk? ... on it from the old strap. I've tried a few home remedies for cleaning brass with only limited success. Should I try taking a wire brush to it? I don't want to wreck it, otherwise I'll have to buy a new buckle set, which means extra cost for the customer (and me). 

Any advice would be greatly appreciated!

[Webicons]

If it’s brass plated I wouldn’t do it.  The gunk may be actually below the plating and abrasives may exacerbate an existing crack.  If it won’t come off with a toothbrush, soap and hot water then let it go. 

TheBuckleGuy.com has quite a selection of watch buckles for a few bucks.  If you’re going through the trouble of making a new strap then definitely worth the investment. 

If nothing else, warn the customer of what might happen in writing. 

Edited February 28, 2018 by Webicons

[Nuttish]

This is what ultrasonic cleaners are for. Degreaser or mineral spirits should help a lot.