Didn't work for us. Liberally coated the bird feed and still the squirrels came. We had the misfortune to have them in one of the lofts as well - smelly, noisy little ba**ards. Had to get the pest control officer out to them. After he had caught one he told us that if we were asked by his bosses what he had caught we should reply that it was a rat. The reason being that if it's rats then there was no charge, if it was squirrels then we would have to pay £75.Possible solution to avoid damage could be chilli powder
Saw it on a wildlife program where they added it to bird feeders, birds are unaffected by the spice but squirrels hate it