I hate cleaning things, and am a bit lazy about it, but still want to keep my gear in good trim. I like Easy and Unobtrusive.
I use Kanger Aerotanks for my carry-around gear, and they get pretty gunky with use -- in particular the airflow holes in the mini, which get clogged after a while. Generally I just give them a good rinse in tap water each week, and they're fine.
For a thorough cleaning, every month or so, I tear them down completely and I put them into an electrosonic cleaner I got for under $20 in a clearance sale. The cleaning solution I use is just distilled water mixed with a cap full of cheap rot-gut vodka. VapinGreek did a YouTube video last September called "Kayfun Cleaning, DX Cap and a simple quick build" -- the cleaning process he uses is how I clean my Aerotanks and the heads, as well as my Kayfuns. Todd Reviews also has an old video up on electrosonic cleaners -- I recall the before/after shots impressively show what these devices can do.
Not at all a must-have item, but electrosonic cleaners work well, are easy to use, and not a high-ticket purchase. 20 minutes after putting the stuff into the cleaner, and giving it a quick drying, it's all good to go, except for the Aerotank heads which need a day or two to let the wicking dry out.