It only as good as you are at cleaning, Survey first explain to customers what will happen.
I tend to know if custy is going to try it on, Has happened once to me as it was an old man who thought he was a jack the lad. As always I cleaned the dirtiest part first and got him to check he said he was'nt happy, so I walked away. Funny thing is that he walked back over the carpet in welly boots that was obviously the reason for the state of the carpet in the first place.
Its works for me and its only a Gurantee that makes the customer feel safe, you only have to do what it says if you are not on the ball and doing a bad job.
Dave, not totally happy with price but think it will leed to more work on a maintenance basis, so will be worth more in the future.
Cheers
neil