Been using the usual vinegar solutions all this time but finally found some Lemi-shine to try .....
WOW ! .... faster and easier to use , throw it in some warm water and you are on your way.
I use a little paint mixer that holds a five gallon bucket so I tossed in a coffee can full of 45 acp and about a gallon of the Lemi-shine mix and let it tumble for about half hour ,.. amazing.
Works very well on the brass thats been exposed for a long time outside .... the "olive drab stain"..
cleans it up very nicely .
Did an experiment earlier with a bunch on 9 mm brass(from my current collection) and three shells I found out in the desert near a military base ...think they are fifty cal , big ones (turns out they are probably 20 mm, thanks for the input guy's)but having been out laying in the elements for years .... green, corroded rust caked on , probably been there since the war ....
Washed the nine's for a while till they looked decent then threw the big ones in the same batch and tumbled for an hour.
Between the Lemi-shine and the 9mm brass tumbling , the big ones came out really nice , mind you they still had all the corrosion pits and dents but was impressed how the citric acid solution worked !
Just have to stock up on some more of that Lemi-shine now ......
digger