If you can easily remove your barrel- as with a hawken- it should just be 1 or 2 barrel keys, take the barrel of. I put the barrel breach end in a bucket of boiling water- then take a large patch on a jag and worrk it up and down the bore- the somewhat tight patch-to-bore fit will pump the water up and down the bore through the flash hole. Change the patch a couple of times- it dosn' t take very long to get it clean. This will also get the barrel really hot which is a good thing- I stand the barrel muzzle down on some newspapers overnight to drain it, and the hot barrel helps the rest of the water evaporate quickly. The next day I' ll run a patch with a tiny amount of Birchwood casey sheath down the bore- never had a speck of rust yet.[8D]