Good day Brian,
I'm w/ the Tom's on this one. I use peroxide on all my copper/brass that is looking crusty, and gently swab them with a Qtip while still wet. The only downside i see is that they often turn a nearly black color for me as the verdigris absorbs the chemical reaction, but some retain the green or gain is back over time - seems random. Tends to even out discolorations as they tone also. I've never tried leaving it in the microwave, just boiling the peroxide first and then submerging on the counter...but will have to give it a shot. Seems to harden the edge verdigris that often flakes away. Figure you can't hurt a coin that is already damaged.
For relics and nickels, i like Acidmagic that you get at any big box HW store. Really cleans up those items if you are simply looking to display and they don't have any unique value. Quick bath, brass brush, fresh water.
Pictures of an 08s IHC that needed some help and got the peroxide (i know, rare, but not going to hurt it when covered in concreted dirt and suffering splotchy verdigris - least now it can be conserved and enjoyed), and some 1800s GT relics before/after w/ the acid.
Been a long time since we met in NV if I recall correctly!
HH,
Zincoln (Brian)