I tried dripping exactly once. For me, it was nowhere near being worth the hassle. I didn't notice any real difference in taste, but it was only a few weeks into my vaping experience, and my taste buds had not recovered completely from my decades of smoking.
For cleaning cartos, I bought a battery connector (threaded end fits the carto, other end is meant to be pressed into the tube holding the battery) and attached it to the end of a 15ml syringe, so I can pump iso alcohol through it. A couple of syringe fulls from a bowl to flush it out and then sucking in perfectly clean alcohol, checking to see that it's still perfectly clear when it comes out.
Sadly, there no good way to attach the connector -- I reamed out the Luer lock threads, widened the tube as much as possible with the blunt end of a larger drill bit, heated the connector, and melted it into the tube. It looks like it was done by a drunken monkey, and I won't be surprised if/when it comes out. But until that happens, it's been working like a champ.