Have you thought about breaking it up with a hammer first? Even the smaller bits may crush up.
Shaun
are not that big spots to use the hammer I think (may get some small one), think it could push more stuff in deep as its already is
at the moment I said the price and now is their decision if thay pay for it after speaking to the builders, told them that thay should pay for it or just make a claim for new carpet as this is just one big disaster, just she seems to be too soft to deal with them
if she will back, I want to deal with each spot (a lot spots) before the final clean of the whole are.