Yeah, don't do that. I cut a straw in Half use toilet paper over the battery post and use the straw to clean around the post.
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Yes, never saturate a battery.
The entire tank assembly (coil, both wicks, tank, tip) is water proof. There are no electronics there that can go fubar.
Juice dribbles on the top center post are normal, you can wipe those off when you see them.
If you switch tanks often like many of us do to swap flavors, the tank threading will inevitably collect residual ejuice along with the "moat" around the center post. For this situation, my routine is to grab a tissue, (not paper towel or napkin as those are made of a coarser material and aren't as highly absorbent or as soft as facial tissues.) I roll the tissue into a sharp point, stick it into the moat and rotate it around. Cleans it out nicely without the need for a toothpick or plastic straw.
To clean the threads, I soak the tissue in 91% Isopropyl alcohol and hold it over the threads and rotate. Some gray stuff always comes off, and the tanks then screw on more smoothly. Just don't use rubbing alcohol to clean wicks, as it's not made to be consumed. Leave that to hot water or vodka/PGA, and let it dry.