I mixed up a tub of oxalic acid and I have a pile of Sturmey Archer rear wheels from the co-op, sitting on the patio waiting for a quick dip to see if it improves the chrome rims (the hubs will not be dipped).
Somehow I was not able to work up the enthusiasm to complete this task tonight, so wish me luck tomorrow. I covered up the oxalic acid so birds and critters wouldn't get into it.