Having done several carto boilings now, I saw that just dropping them in boiling water serves the purpose of disinfection and loosening debris and such somewhat, but laying on their sides doesn't do much for actually getting old juice out. I realized the boiling procedure could be improved by standing the carto on end (battery connection down). When the water starts to boil, you get a nice chimney effect inside the carto. The rising water and bubbles not only loosens things....it lifts them out of the carto. The hardest part is keeping the on-end cartos from falling over inside the water. I solved that by making more stable "packs" of cartos with a twist-tie. Give it a try....I think it gets the cartos cleaner and reduces the ammount of time you need to spend later with a syringe or turkey baster to get remnant flavors out.
