@lordpeep.....
I am so redneck, but I will tell you how I do it...
*first I rinse them under the tap with hot water to flush out any old juice.
*Then I soak them in moonshine. You can use vodka or everclear if you dont know anyone from the hills.... (I soak for a few hours)
*then I stand them up, battery end down in a flat bottom small pan and slowly pour boiled distilled water into them till full and coming out the end. (I just boil the water in the microwave)Let cool till you can handle them and rinse under the tap to flush.
*I do this a couple of times.
*The last boil do not flush with tap water... use a turkey baster to flush with distilled water unless your tap water is filtered.
*do a wicked thermometer shake over the sink to get rid of excess water holding onto the battery end
*Bake in an oven battery end up at 175 degrees for one hour. Turn off oven and leave sit over night.
I have about a 85 percent success rate. Only real problem I have is certain flavors really want to linger, but I just use the same flavors in those carto's.
there are other methods, and if you use the search bar you will hit a few... this is just what works for me. Some people boil them in a pan... I tend to forget them and then it DOES ruin them!!!
good luck!!!!