Today I did my first cleaning session, mostly because the (inside) chamber part of the tube got a little gunky so abv would stick to it a bit and also because I was curious to see how well it would work.
The cu itself didn't seem to be too gunked up, the draw was still free flowing. I would also like to point out that after ~25 sessions it was still surprisingly easy to adjust the chamber, even when increasing the chamber size (which also can be done while loading by gently pressing the herb inside the chamber). It might smear a little residue, but once the tube is inserted this part is invisible anyway, also the outside of the tube stays clean and lets you handle it hassle free.
As the o rings of the cu are silicone, they will have to be removed prior to soaking in iso. I find that to be a major disadvantage, simply because they can get lost easily. I hope future devices will have an extra set of them. I don't recommend peeling them off with fingernails or the like, that's bitchy. Much easier: squeeze them a bit to create a loop which lets you easily grab and pull them off.
The tube is clean in no time with the help of some hot water and handwash soap or the like.
I soaked the cooling unit minus the o rings in a shot glass with 99.9% iso, let it soak for 10 minutes, then rinsed it with mild soap water and some more hot water. It came out clean as a whistle, no weird taste or anything like that at all.
I also took the opportunity to disassemble the tube holder to take a look at the mesh right above the coil. All parts were still clean, I suppose I will have to check that every 3 months or so.
So cleaning is easy and hassle free.
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Someone asked for or photo of the inside parts of the cooling unit, so here's some nuts and washer porn:
This is an unused cu, it is clean, doesn't smell oily or whatever. And it works really good.