Buy some Wipeout - does what it said on the tin!
i think you will find that it's kg12 for copper.richard.i use the kg range of products and find them to be very good. If i remember rightly, kg1 is for carbon and kg2 for copper? Whatever numbers are which, kg seems to work well.
Have you been doing much recently? Ive done a bit of long range plinking and a little bit of stalking but probably wont be out til april now.
Forrest Bore Cleaning Foam.