I assumed that a drill bit of the correct size was safer than a torch tip cleaner (of which I already have) as the bit really only cuts on the tip and the torch tip cleaner is actually a file that cuts on the sides. Keep in mind that i'm not putting the drill bit in my b/o drill i'm just going to twist with my fingers.

I see a lot of posts about using a 1/8 bit to clear the fouling. Does the fouling just build up where the primer is placed and not down the flash hole?

I think I found that the flash hole is .028" which would be a #70 drill? Pretty sure that the average hardware store won't have this drill.