preventative maintenance
if you taste that the flavor/vapor has gone moot on ya,
you waited too long...
I've found that if you catch it BEFORE coil failure occurs,
soaking at that point & kanger coils last a long, long time...
(
before the point of dis-assembly and dry burn is needed)
if I encounter a stubborn stain (old juice flavor or burnt taste),
my extreme is a 5-10 min soak in wht vinegar followed by a rinse
then 5 min soak in vodka (to remove vinegar) -- rinse/dry/vape
I feel long term harsh liquids, boiling water, or compressed air weakens everything (plastic, silicone)
I evolved into this technique using kanger coils and it has turned out to be working very well
and now applying it to my Aspire/Vision top coils...

JMO