I just blow mine out every day, bpblow from the battery end, then I put 10 drops into the hole on the battery end, and blow that out. I repeat till it blows out the same color as I'm putting in. I then prime it one more time. The color of the schtuff I blow out is almost black! Yuck! Then when you put the new tank in, give it a couple of drags without pushing the button, that's all I do, and I get tons of VAPE! I had read on here that they really don't like to be cleaned, so that's why I just blow them out. I'm going through 6-10 carts a day for going on two weeks. Now flavor is a whole nother thing altogether! These (tank systems) things don't have the flavor a normal 510 atty does, sometimes I'll take my 510Mega and fill it with the same juice in my tank and VAPE them side by side to compare the flavor, and hands down the regular atty wins every time. Hope this helps with the one you haven't cleaned yet. You should get it working better if you just blow it clean, good luck.