We have problems with our neighbours cats, three of the feckers poop every where. tried everything you can buy, cat pepper/pellets but do not work. They just smell it and carry on past. Apperently you can buy lion wee-wee, that is supposed to deter them. Its never in stock at my local garden centre so it must work! My dads neighbours cat sits on his bonnet and scratched it to sh*t, as well as the windows and roof.