I feel so daft asking this but we have a miele cat and dog, I assumed carpets would be spotless but they're not. What am I doing wrong?! We have 80% and 100% wool carpets, a normal cheapie thick carpet and some textured woven rugs. The miele is missing picking up little bits and i hoped it would pick up cotton wool stuck in the carpet too but it isn't. Bag is a proper miele bag, not full, we use it on full power (carpet mode) or rug mode. Also should the air thing on the handle be open or shut?! We have it shut. Thank you!!