http://www.rshughes.com/products/079340_30524.html
Permatex and NAPA brand are also excellent.
Man... You won't believe with a decent angle grinder can do with a wire cup!!! My cup is a Hitachi brand and my wheel is a DeWalt brand.. Both purchased at Lowe's for about $15/ea.... You'll never chuck a wire brush in a drill again!
Here are representations of what I'm talking about that I'm sure will work fabulously...
http://www.lowes.com/pd_77591-70-DW4...cuo&facetInfo=
http://www.lowes.com/pd_77594-70-DW4...ire&facetInfo=