After watching several YouTube videos during my first week of vaping, I was impressed with one method of cleaning cartomizers. Sorry, but I can't remember who created that video, but I'm thankful to whomever did. After vaping for a month now, I've found that this method works great and is very cheap. The tool needed is less than $2.00 at Walmart: a 10ml syringe kit, with a rubber cone and a 5ml measuring cup (which isn't used to clean cartos).
I don't use boiling water, because I discovered that very hot water will shrink the filler inside the cartos. I only use hot tap water...no rubbing alcohol, no vinegar, and no distilled water. I don't think it's necessary, but it's always possible I'll change my mind in the future.
In the kitchen sink, I'll fill a container with hot tap water, attach the threaded end of a carto to the end of the rubber cone, attach the rubber cone to the syringe, and then draw the water in through the carto with the syringe and then back out into the sink. Keep doing this until the water coming out is clear -- probably 6 to 8 times is sufficient. If you clean your cartos regularly, it shouldn't take many plunges to remove all the old liquid and gunk. Then I reverse the position of the carto and insert the mouth end into the rubber cone and repeat 3 or 4 times. Then plunge the syringe back and forth about 15 times, pushing air through the carto to remove all the excess water. Then remove the carto, blow through the mouth end to remove whatever water might be up near the threads. Then place the clean cartos in front of a fan for 3 or 4 days. I like the filler to be completely dry inside and don't want to add liquid to a damp filler. It takes more than overnight for the filler inside to be completely dry. When you refill the clean cartos, they will taste like new.
When your cartos start tasting funky, it's time to clean them or replace them with new cartos. I'm planning on cleaning my cartos at least every other time they need to be refilled, but more likely, every time they need to be refilled. This will depend on how many cartos I have on hand that I'm rotating, but I hope I'll always have plenty on hand. I wash my dishes every time I use them, so it makes sense to do the same with cartos.
When I refill cartos, I let them sit for 24 hours. In my experience, they are much better when letting them sit for that length of time, especially when using the eGo 1000mAh battery.
Also, be careful when plunging dry air through the cartos. It's real easy to pull up the plunger too far and break the end part of the plunger. I did it once and had to buy another kit.

I don't use boiling water, because I discovered that very hot water will shrink the filler inside the cartos. I only use hot tap water...no rubbing alcohol, no vinegar, and no distilled water. I don't think it's necessary, but it's always possible I'll change my mind in the future.
In the kitchen sink, I'll fill a container with hot tap water, attach the threaded end of a carto to the end of the rubber cone, attach the rubber cone to the syringe, and then draw the water in through the carto with the syringe and then back out into the sink. Keep doing this until the water coming out is clear -- probably 6 to 8 times is sufficient. If you clean your cartos regularly, it shouldn't take many plunges to remove all the old liquid and gunk. Then I reverse the position of the carto and insert the mouth end into the rubber cone and repeat 3 or 4 times. Then plunge the syringe back and forth about 15 times, pushing air through the carto to remove all the excess water. Then remove the carto, blow through the mouth end to remove whatever water might be up near the threads. Then place the clean cartos in front of a fan for 3 or 4 days. I like the filler to be completely dry inside and don't want to add liquid to a damp filler. It takes more than overnight for the filler inside to be completely dry. When you refill the clean cartos, they will taste like new.
When your cartos start tasting funky, it's time to clean them or replace them with new cartos. I'm planning on cleaning my cartos at least every other time they need to be refilled, but more likely, every time they need to be refilled. This will depend on how many cartos I have on hand that I'm rotating, but I hope I'll always have plenty on hand. I wash my dishes every time I use them, so it makes sense to do the same with cartos.
When I refill cartos, I let them sit for 24 hours. In my experience, they are much better when letting them sit for that length of time, especially when using the eGo 1000mAh battery.
Also, be careful when plunging dry air through the cartos. It's real easy to pull up the plunger too far and break the end part of the plunger. I did it once and had to buy another kit.
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