I have found the comments on this thread most interesting.....
I would like to add that I get one or two calls 'every' week about upholstery alone from either cleaning technicians who are having problems cleaning items of furniture also customers who have had items cleaned and its all gone horribly wrong.
Some of the chemicals that have been mentioned on this thread often feature in the complaints I hear about... not the chemicals fault just wrong time, wrong place and application.
Some of the technicians involved have been in business for years, have excellent reputations but they have fallen into the trap of "I've cleaned the same way using the same chemicals for years"...
well chemicals are reformulated from time to time and fabric constructions and fibre blends change and different dyes may be used too
Please 'do' learn the trade ...don't take risks... clean safely