Cleaning rust from muzzle?

[Kleinzeit]

I usually clean the same day I shoot, but a little while back I went out shooting with some friends, got home late, yada yada yada...

I was very disappointed, when I finally got around to cleaning it, to find rust at the top end of the barrel. It seems to be okay inside, but the rusted area ( as you can see) is very close.

Is it okay to use some 0000 wool? Is a brass brush better? Or should I just leave it alone? This is a CZ-75 SP-01.

http://farm8.staticflickr.com/7071/7263035192_798204ec44.jpg (http://www.flickr.com/photos/22921063@N03/7263035192/) DSCF6166 (http://www.flickr.com/photos/22921063@N03/7263035192/) by Kleinzeit (http://www.flickr.com/people/22921063@N03/), on Flickr

http://farm8.staticflickr.com/7093/7263035764_c3f75024be.jpg (http://www.flickr.com/photos/22921063@N03/7263035764/) DSCF6150 (http://www.flickr.com/photos/22921063@N03/7263035764/) by Kleinzeit (http://www.flickr.com/people/22921063@N03/), on Flickr

http://farm8.staticflickr.com/7089/7263035396_42b96550b3.jpg (http://www.flickr.com/photos/22921063@N03/7263035396/) DSCF6162 (http://www.flickr.com/photos/22921063@N03/7263035396/) by Kleinzeit (http://www.flickr.com/people/22921063@N03/), on Flickr

[Kleinzeit]

I already cleaned off as much as I could by soaking it in some Breakfree and going at it with a q-tip.

[Bill DeShivs]

Use 0000 steel wool, dry.

[Kleinzeit]

Thanks.