i cleaned this suit last week the full suite came up mint apart from three cusions

useing h.m. fine fabic it was totaly black he went on to tell me he had a homeless person sleep on it !
at frist i thought it was browning but the rest is totaly mint , so if it was browning the rest of the suite would be the same , maybe its just worn more

maybe i need to try a better pe spray any help would be good , the custy tried to clean it again befoure a got back to see what was wrong :

why do they do that ?