The best plant I have seen is at Franklins in Sheffield.
In 2002 the early version of the Sunny day out included a tour of this place .
Pre inspection and documentation was a much emphasized part of the process, this was the fll time job for one person.
The rug beater they had was amazing, it removed piles of grit from coir matting and rugs alike AFTER being vacced with a Sebo.
The rugs were then taken up a conveyor belt to the next floor where they were mostly immersion cleaned and rinsed with a pressure washer.
After this the excess water was extracted.
They had racks made of scaffold for drying and air blowers to speed it up.
One room was dedicated to rug repair , and this included the repair of holes 150mm across not just a few tassles, though they were putting new fringes on a few rugs.
At the time they had a national contract with Johnsons and had dozens of rugs on the go. Well worth a nosey if you can blag a tour.