If it has a small crack on around the base of the Clearo, empty it and seal the crack with clear nail polish or some silicone if available, let it dry for 24 hours before refilling.
If you have excessive leaking onto the battery post, check the seal at the base of the drip tip & the silicone cap on the center post, make sure it's even all around. Sometimes when replacing the silicone cap, it can be off center and create a gap between it and the drip tip, tipping causes the liquid to leak excessively onto the post. If it's off center, use a paper-clip or toothpick, placing it through the center of the metal tip, to gently center the cap.
I've had both of the above problems and fixed them with these methods.
Want to add a note here. Do not use standard "super glue" to seal a fractured clearo. I did, and was quickly reminded super glue melts plastic. lol
I've also had one drip tip that slipped above the threads above the o-ring. I can't find the words to describe the process, so I'll just say compare your 2 drip tips and see if the threads look seated differently.
I no longer fill to the 1.6ml line. I get liquid leaking to the battery post, and gurgling every time I do, on the short and long wick clearos. I end up losing half the liquid just trying to blow the center dry. I stop at 1.4ml.
When I do get liquid into my battery, I use a napkin and toothpick. Then I'll give it a few good tokes without the clearo, and most of the time some more liquid will come out. Repeat until I'm pretty sure it's all out.
The only time I wash a clearo is when I change flavors. I blow out the center, then set it on an a/c vent tip side down, without the tip - all day. When it's dry, I blow out the center again to be sure. If it gurgles, I'll dry burn if I'm a bit rushed. Otherwise, it goes back to the vent. Experience tells me if there is ANY liquid in that center hole, the clearo's just will not cooperate, and end up leaking.
After filling, if I notice any liquid near the center hole, I use a q-tip to dry it before I screw in a completely dried drip tip.
-x1300 auto user