Derek you are obviously an experienced carpet cleaner with many years under your belt, hence giving loads of advice on here which is to be commended, but sometimes you have to stop and think before you advise because what may be obvious to you may not be to someone else.
So when he says Berber and you say 'without hesitation' I think that's like going to see the Doctor and he gives you some pills without even asking what's wrong with you.
Just my hobby horse mate, no offense.