Okay, for my v1 Sweepy, cleanup was easy — just remove the Festool hose, connect a brush:
https://www.festoolusa.com/accessory/440404---d-36-sp
and go
Unfortunately, not having any luck finding a brush attachment which fits the Sweep v2 2.5" adapter — has anyone found one or an adapter which fits the twain?
I think you are looking for this
2-1/2 in. Locking Accessory Round Dusting Brush for Wet/Dry Vacs
https://www.homedepot.com/p/304753663
It’s great and I use it everyday. I would love a crevice tool that also has these bristles on it. If someone has found one - share the link
Actually, I bought that — the problem is the Sweepy v2 2.5" adapter doesn’t fit it, nor the Shop-Vac Extension Wand (which does fit the accessory brush).
I’m a bit worried that the extension wand is going to be cumbersome — ideally there would be a short connector which would fit the brush and the adapter together.
Wondering if this:
would fit inside the v2 2.5" adapter — it would then fit the brush.
I say invest $500 in a 3D printer and never again spend time looking for adapters to buy 
(well, to be honest you will likely be spending the same time designing parts in CAD software than you were browsing the interwebs for parts, but I find the former much more enjoyable and rewarding)
I’ve got a printer which I need to get up and running after I work up the space to set it up.
One of the reasons I wound up here rather than at:
is I just don’t like the appearance of a 3D printed part — it’s also a matter of “Napoleon’s most precious commodity” — I’m pretty sure it would take less time for me to drive over to the other side of the river to Woodcraft and source a part. If not, I suspect I’ll be buying a PVC plumbing part and making a pair of fixtures to modify it.
Success!
Bought a:
Shop-Vac Extension Wand
https://www.lowes.com/pd/Shop-Vac-1-Piece-20-in-Extension-Wand/1098959
cut 5" off off the large end (4" would have been better I believe, had to use some tape to correct for a sloppy fit)
and then add a:
WoodRiver Dust Connection - 2-1/2" Union Fitting
