We have a lovely evergreen just by the front door to add a bit of privacy. Last year tiny black creatures appeared in clumps on the leaves. This year they have spread to every branch of the ever green and now cover the front door! They seem to be attracted to the white paint around the door and also my milk when it is delivered is covered in them! Now the aphids have spread to the rose bush that frames the door. Please advise me. Do I cut the bush down? I'm afraid washing up liquid in a spray bottle Isn't enough. We've tried it but the bush is big and I cannot reach the entire plant.