I used to use the old 3m cards to demonstrate to custy benefits, tea and coffee over the sink etc but you will be suprised how many call backs you get from them because the cards dont reflect actual circumstances.
They will actually expect the carpet/suite to perform just like the card, well it cant.
I usually say the carpet in here would possibly benefit from protecting, ask if its been done before, it might need a top up.
If they have 3 kids eating pizza and coke on the sofa, nothing will help it but if they have a nice carpet and want to keep it looking nice perhaps you might think of this etc etc.
Sometimes just offer to do the main wear areas through the lounge and round the dining table, you put less down and less work.
Murky