Just to put the cat amongst the pidgeons.
You go to a house with a wool bedroom carpet armed with the above chemicals, that has fake tan marks, dog wee stains, unknown yellow marks, unknown red marks etc, and the custy insists that you try and get them out?
You would of course say that some of these marks will probably not come out.
But how would you charge the customer, knowing that some of the above aint going to come out?
John