ok need some help, i have a canon smartbase mp360 all in one printer. i recently returned from an extended holiday to a broken printer!!! i replaced the ink cartriges but am getting banding on my black ink and sometime it just doesn't print. this is very frustrating so i phoned canon and was told that my print head needs replacing, only i'm out of guaruntee and it's going to cost £50 for a new one!!!!!!!!! it was suggested that i should try cleaning my printhead myself using windolene. is this safe????!!! and also i have no clue as to how to remove the print head?! if anyone has basic instructions on how to do this as i'm a bit of a novice and i'm scared i make it worse! please help!!!!