If CLEANING is what you're after, then simply find a plastic spreader knife / spatula, the type used to fill holes with spackle (household repairs). Cut the Scotch Brite Pads to fit over the spreader blade, then using your favorite method of gluing the scotch brite to the blade, or using your fingers, or a nylon zip tie, then scrub the vanes. You're basically covering a flat stick with a scrubbing surface. This will give you, essentially, a stiff scotchbrite stick, to insert between the vanes. As you press towards one vane, the softer ends of the bristles of the opposite side will scrub the other side of the opening (i.e. the OTHER vane). Then a couple of good scrubs on the other side and you'll have scrubbed BOTH sides of the vane separation hole. In this manner, although labor intensive, you can apply as much/little work per vane opening as needed. While the cross buff's mentioned are excellent for POLISHING (i.e. with ROUGE and other metal polish), you may find that the spacing between the vanes is ROUGH CAST, or at least to my memory they were. Due to the description of the cross buffs as being able to provide a "mirror-finish" ("Use with metal polish for polishing inside diameters such as lug nut holes and contures of aluminum wheels. These felts will also provide a mirror finish in exhaust ports, combustion chambers and carburetor venturis. 10/pack=$32.00") you may find that the rough cast surface is rougher than a lug nut hole and you go through a couple of packs....and you're up to $64.00 plus shipping. If your openings are smooth, then that's a different story, but I can't even imagine how much it would have cost to have those professionally polished to begin with. FWIW E