Try lararrk's suggestions first.
But.
If you vape "tank cracking" juices, they may be causing the plastic to deteriorate. If that's the case, cleaning won't help. (If the clear plastic tube, no matter its color, is starting to look cloudy, it's being attacked by the juice. Some flavors will do that quickly, some over a bit of time. If that's what's happening and you really like that flavor, you'll need to get a topper with a pyrex tube.