Deback is correct that the 510 cartos, even the genuine Joye brand, can be washed out by using a child's medicine syringe -- no needle involved -- that comes with a rubber cone that attaches to the business end of the syringe where a needle would go if there was one. This can be picked up in any drug store. They are used for administering liquid medicine to infants and small children. What you can do is attach the rubber cone to the 510 carto on the battery end, then attach the syringe to the other end of the cone. Run some very hot, not boiling, water into a bowl. With the carto now attached to the rubber cone of the syringe, put the mouthpiece end of the carto into the hot water and draw water into the syringe, then push it back out. Do this maybe 10 times to flush out the juice and any impurities. Then pull the carto out of the water and point it into the bowl or a sink and pump the syringe about 50 times quickly to force air through the carto. This will push the excess water out. They will finish drying on their own in a day or two, especially if you have a sunny spot to stand them up with the mouthpiece at the top.