When you sign a contract at Atiyeh Brothers to have your rug cleaned, pay close attention to the disclaimer at the bottom: "We are not responsible for running or changing of colors of rugs or carpets or for shrinkage resulting from cleaning."
They mean every word of it.
They did an acceptable job on our 1940s Sumac carpet and on a Sumac hall runner from the same era (We figure the values at a little under a $1,000 each) although on the latter they didn't take the time to trim the cotton they used to reinforce the stitching along one end (see below).
On our contemporary 3x5 Iranian rug they invoked the disclaimer. We paid $500 for it and it we were lucky, we could get $250 at a garage sale. "We didn't know it had cotton in it" the technician said in explanation of the bumps and dimples in the body of the rug and the rippling and buckling along the edges. They tried resoaking and blocking the rug- which I think they should have done in the first place- which "got a lot of the dimpling out" but did nothing for the borders. "They cut corners by using cotton so it's the best we can do," he said shrugging his shoulders. He had no explanation for why Portland's "finest rug cleaning specialists" wouldn't have checked for cotton or warned us specifically of the risk with newer rugs.
I could have done a better, safer job with a carpet cleaning rental from a local supermarket. In future... I will.