I just tighten my rifle up in the vise, with a level barrel, pull the bolt and insert the bore guide, give the Wipe Out a 1 sec burst into the muzzle until the foam just starts to come out the bore guide, then release. Foam out the muzzle and just a bit out the bore guide.
Then patch it out after anywhere from 1 to 12 hours...
No mess, no fuss...