Years ago, i was told by an OLD Kirby salesman (who now owned the distributorship), that the Rainbow really will do everything they say it will, BUT, what they (the Rainbow salesmen)dont tell you is that the water has to be changed at least every 15 mintues while vacuuming, in order to keep the water wet,(and not turned to mud),,and you cant pic up any kind of material that is impervious to the wetting action of water,,such as talcum powder, suet, fireplace ash, ect., because it will all go right out the back of the Rainbow.
He also said that they had never seen a Rainbow with a clean motor in over 35 years (they repaired all makes and models of vacs back then),,,the motor of every Rainbow they had ever taken apart had a dirty motor, caked in dried mud,,at least to some degree or another.
All the more reason to trade it in on a new Kirby, of course!
(wink)