Develops the worst pile reversal issues.. I had a two year battle with a management company/installer/homeowner/inspector/manufacturer with a house that was horribly pooling all over traffic areas.
Inspector of course insisted (twice they were sent out) that he can clean the carpet with lukewarm water and make everything even looking. (at this time I threw everything at it at least once: diesel fired heat, high flow, low flow, 360XL, wand only, pad only,
compound,
crb, I mean everything and it still looked the same after a day or two.)
Inspector implied that I don't know how to clean carpets...
Bottom line is: carpet was replaced....and the homeowner ended up paying for it! I cleaned the place at least 5 times for free, to show them all the different methods and effort can not make the pile reversal magically disappear.