... After the clearo has had juice in it the dry burn would be useless. ...
I dunno if I would agree with that.
Haven't you ever Revived a Filler Less Carto thru Dry Burning that has been filled before?
A have about 8 CE2's drying out after being Rinsed in Hot Water that I am going to Dry Burn today. All of them have been filled about 8 or 10 times before. Some have been Dry Burned More than Once.
-----
A note on Dry Burning Before the First Fill.
When I start a New Filler Less Carto, before I fill it, I remove any seals and then give the Power Button a quick 3 Second push. If no Smoke comes off the Coil/Wick, the Cart is Good to Go and I fill it.
But if I get a Tendril of Smoke coming off the Coil/Wick, the Carto gets a Hot Water Rinse and is Set Aside to Dry. Once Dry, I repeat the Dry Burn. No Smoke and it gets filled.
Many people say you should just Grit Your Teeth and vape thru the Bad Taste of a New Carto. I have to smirk at the thought of People vaping Machinery Oil for the first Fill when doing a quick Dry Burn and or Hot Water Rinse BEFORE filling would have removed any Contaminants.