Busy day in the garden

I'm no rose expert but I just realised mine are covered in black spot! Not good, but I've been busy googling and reading up on remedies. I've got quite a few rose bushes, collected over the years (usually birthday or Mothers Day gifts from my offspring. Now I can see the dreaded blackspot is spreading to them all! Tomorrow I am going to try spraying them with washing up liquid and water - hopefully this will help. Another remedy was one part milk to two parts water......but I don't really want to give them white spot!