Few years ago I ordered two CW paddles from UR5CDX (Yuri).

One in Chrome, other in Brass. Unfortunally the Brass take with me on the sailing boat....yes after 3 years vy bad looking. Then I took them to the shack in TA3 where I them vy nice polished in autum 2018.
For preventig to becom dirty again I applied a small film of oil.  Now autum 2019 - was looking bad again.
I unmounted all parts again and a gild taller polished them for me. Now before I mounted the parts I applied a clear paint.
So I hope this now keeps the shining surface.
See pictures.