Subject to testing there should be no issues with the clean. Though a synthetic fibre, I find that the best results on polyester rugs are obtained by treating as wool. M-Power is the best product and follow your training regarding shag piles.
To add to JB's response, these microfibres can cause a Vacuum cleaner or an extraction machinewand to lock down on the carpet, producing almost zero airflow. It is essential to take steps to by-pass this.
A Brushing vacuum cleaner can cause too much shedding but you can use a non-powered attachment and of course back-dust or indeed hang it over a line and use a carpet beater (I still have a couple of wicker carpet beaters that still get used on occasion).
Hi Nick yes thanks , was going to do it , customer says they Dyson it most days even though it says don't , its the dog smell on it that bothers them more so good old M power will sort that , well normally does cheers chaps