Yes, caustic soda.
However it is more than a one trick pony. You, or your transport arrive on site with your load of boxes of combs (it takes the whole comb, so no need for chopping out and scraping at base, the plant does it all for you). The boxes of combs are unloaded into an internal store with biosecurity (never know what might lurk in then thar combs).
Your transport then gets steam cleaned...very thoroughly.
Combs are deboxed and stacked in racks. Boxes go to be sterilised at this point to meet the frames at the other end.
Combs in racks go into tank 1.........boiling water...........and steam jets coming through the water melt everything out, even oldest blackest combs.
At this point all the slop (wax coccoons etc) are sluiced off and go into a steam wax press system, and nearly all the wax is recovered (beekeeper can take away later, or trade in).
Frames then go into a caustic boiling tank for 2 minutes only (it is enough, and any more softens the wood)
Then out and into another boiling water tank.
Finally a quick whish over with a steam cleaner, then returned to the boxes they came from. Boxes removed to a second store, also bio secure, and for cleaned gear only. Finally loaded back on the sterilised truck for taking away.
Can also be supplied back ready with wax installed for immediate use.
Everything carefully tagged for safe identification of owners items.
Full time staff wil be running all the admin, booking system etc.. Mainstream simple supplies will also be available, at reasonable prices. The existing polystyrene hives will also be on sale through this system. Bee feeding, etc etc.
Main users expected to be larger individual beekeepers and associations.
To encourage association membership and bee base registration there will be incentives to do so.............it will be cheaper to join and use the service than to use the service if not an association or beebase member.
Other services may follow.