You are right, ISO alcohol doesn't leave a residue. Rubbing alcohol does, I believe, and should be avoided.
There is wide range of opinion on what method is best, which may be because people are talking about what works for their atomizers, and there are a lot of different atomizer configurations. It may be at bottom a coil wrapped up with a wick, but after that, there's materials differences, there's how they are stuffed into the heads, and so on.
A rinse in [some liquid] to wash off juice is a good start. For values of [some liquid] try something that makes the juice go away and doesn't leave a residue, and isn't problematic to pour down your drain. Hot water is generally a good choice here, but it takes longer than alcohol to dry without help. Same with vinegar. I haven't tried denture cleaners, but cannot think why that wouldn't work or be safe.
Baked-on gunk will not shift with hot water. To a degree, it will if soaked in alcohol or vinegar. If you are worried about it tasting funny after such a soaking, rinse with water afterward.
If you can easily see the coil, if it doesn't take tools to uncover the thing, you should be able to do dry burns without risk to your coil. Dry burning has the added advantage of drying your atty more quickly than it would just sitting on the counter. Watch the coil, fire a couple of seconds repeatedly, and when it starts glowing red you know you're pretty much there. Here is a good tutorial on dry burning:
http://www.e-cigarette-forum.com/forum/tips-tricks/69834-my-atty-resurrection-method.html
If you cannot tear down far enough into your atty to see the coil, dry burning will be riskier. You can still soak them and get at least some good from it; I have two eGo-c attys soaking in ISO alcohol for the last 48 hours. The colour of the alcohol has turned a rather attractive light tea. It works, but it takes time. Next step will be to rinse under hot tap water and let them sit on a shelf till I remember them again.
A damp wick and coil will not hurt you, even if it's wet with ISO alcohol (it won't be, not for more than a few seconds) or vinegar, but the first few puffs will taste weak or a bit strange. This too shall pass.