The only "build up" is get is really light and concentrated close to where the vapor comes. Everywhere the fluid touched, nothing or near nothing on the less exposed zones.
The fluid gets a little bit blurred after 4-5 bowls, but no chunks or anything. My idea about reclaim is, do everything to avoid spilling the stuff by condensation and adherence on the surfaces of your air path in the first place so there is nothing that worth a reclaim.
Ahah, I had a crazy idea : A bubbler with engineered anti stick glass. The hard part would be to do that chemically safe.
I change my fluid everyday, and I still use detergents everyday, I have to for my stainless bowls, so I recycle the solution in the bubbler (never waste), so it is perfectly clean.
I putted my solution in a dropper. I still have to find a better source of PACs, I need them more concentrated.