Help! I'm a garden novice and now we're in our first summer with our latest house we've got a beautiful bunch of white roses flowering around our bedroom window (bungalow). BUT I've just been out pruning and discovered my roses are teeming with some strange little brown bugs. I want them gone! But what do I use? My friends advised that I add a drop or two of fairy liquid to water and spray the roses...any other tips or is this best?