Do you keep a rock tumbler in your rig? If so throw in the all the coins (less the coppers and zincs). Pour in lemon juice until the coins are almost covered by the fluid. Put in 3 tablespoons of salt and let the tumbler run for about 30 minutes and your coins will be clean. I no longer tumble with small gravel, detergent, and soap.
Congrats on digging in January and thanks for posting your finds so us home bound detecting junkies can get a fix without having to add a pick ax to our tool belt.