Thanks, useful observations..
back in what I used to call north north, I used a dog comber on the rugs, then vacuumed, then took them out to the clothesline and whapped them with something heavy like a good rake., prongs facing out. I might have even hosed them, depending on their original value (not much, use the hose). But that was in an area with the usual temp somewhere around sixty.
Whew.. bunch of effort but it generally worked.
Here in New Mexico, I am watching the rugs get less bright and thinking about working up some kind of outside beam or cable where I can place them for.... whacking after vacuuming, or whacking between vacuums.
I have a steamer, or had (did I put that in the Goodwill or the Vets yellow bag?) I suppose I should try it.