Seen some real " stinkers " over the years, as we do environmental cleans for Social Services and changeovers for a Christian Action charity, who run a housing complex, for, mainly alcoholics.
If I feel the carpets, or furniture are too far gone, I advise the managment and they get replaced.
The main problem with this work, is the machines, hoses, tools all need to be cleaned after each job an clothing washed or dumped.