My method for cleaning my 510 attys:
1. Overnight soak in hydrogen peroxide. This eats away some of the dried crud on the actual coil. There is sediment in the glass when they are finished soaking.
2. Boil in a 20% vinegar solution for 5 minutes. This throughly cleans out any old juice remnants and taste.
3. Rinse under the sink in hot water holding them with tongs for a couple minutes each, shake out, and set down to dry for at least 12 hours.
Not to say this is for everyone, but my attys come out like almost new (only the coil still has dark spots...the wicking is pristine). I've lost 1 atty since I started
vaping Memorial Day weekend. No idea why, but it happened in the middle of vaping, not right after cleaning. Maybe I've just been lucky.