The Type A's were a real pain for me. Still better than carts.
The I switched to Type B's, and then my life improved. I'm still abusing the first Type B atty, in use since 26/04..that's almost 2 months already.
You know when it's due for cleaning when:
1. It starts tasting funny
2. Starts producing less vapour
3. In some cases gives less TH than normal
4. This is less obvious. You start noticing that it runs slower through juice. My reasoning is: due to gunk on the coil, the coil has less juice flowing to it and making direct contact to it, therefore vaporises less juice.
I do take it apart to clean. My method is as follows. I have taken bits and pieces from methods already mentioned by others, and adapted them. Following are very detailed and exhaustive steps, and I find it works really well. I do this once a week. I use this method on Type A's too. My Type A that's working fabulously has survived EcoPure juice this way. I still use EcoPure on it.
1. Take out tank and blow out excess fluid from the batt end.
2. Do around 5 dry burns to avoid the wick sticking to the coil.
3. Take out needle plate
4. Do a proper dry burn till the coil starts glowing red-to-orange, blowing in the atty while and between dry burns to keep it cooler.
5. Scrape the coil using a needle, both along the oil, parallel to the coil windings, and on the sides of the coil. CAUTION: you may kill the atty this way!
6. Do some final dry burns till the coil starts to glow orange and no debris is visible to the eye. Here I notice that the wick running through the coil turns white again due to heat. This is similar to burning a wick using a gas lighter.
7. Bring some distilled water to the point just before boiling and lower the atty into the water using a teaspoon.
8. Leave the atty there, but stir with a teaspoon from time to time.
9. While the water is still hot, I use a pair of needle-nose pliers to hold the needle plate, from the flat sides, not the rounded ones, and dip it in and out of the water for a few seconds to clean it. The I put it on a lint free cloth or tissue paper to blot. I don't burn the wick using a gas lighter anymore as I found out that the wick becomes brittle and starts to fall apart. I used to find fragments sticking to the coil that way. I don't advise burning the wick.
10. After around 15 mins I take out the atty and blow out from the tank end and the batt end.
11. Pour some of the boiled water into the tank end (yes, I do use the same water) and blow while the water is still in the atty to let the water flow around the coil (water pressure adds to the cleaning, also pushing out debris). I do this 3 times.
12. Repeat step 11 but this time from the batt end. Then, a final water blow through the tank end.
13. Blow through both ends and shake atty holding it from the batt end, to get rid of excess water.
14. Wipe the batt connector using tissue paper.
15. Connect to battery and do 3 1-second dry burns just to get rid of excess water in the wick passing through the coil. I avoid getting the coil even close to dark red hot. This step is optional.
15. Put 4 or 5 drops PG along the mesh surrounding the cup. I do this to limit the atty going through the tank like there's no tomorrow, and also to avoid burnt taste (if you don't prime it properly) since water seems to evaporate quicker than pg/vg. This is part 1 of my way to priming the atty after a cleanup.
16. I put the needle plate on the tank, and align the sides of the plate to the sides of the tank, and add a drop of juice on the exposed wick. Using a needle I gently adjust the wick to that it's as straight as possible. (When you first take it out of the atty you may notice that it becomes separated in the middle because it's sitting on the coil. You don't want this when assembling back the atty because you want proper contact between the wick and the coil)
17. Using the tank, carefully push the plate in place. I have always paid attention to how the plate was positioned before disassembly. I have always assembled the same way. I think this does not really matter though. Push well the tank, and check that there's no gap between the whistle tip and the edge of the atty.
18. Part 2 of priming. Take out the tanks and add a couple of juice drops directly on the wick, in the needle.
19. Put back tank and dry vape till you feel the juice is flowing through the tank to the wick. You may hear a slight gargling, but it's not flooding. You may alternatively do this until you begin to taste the juice or feel a slightly tighter draw. Be careful on how many drops you add in part 1 and part 2, to avoid flooding.
20. VAPE ON!!