Although the Minor burner does not have a face plate, the tubes are so thick that you do have to brush them once in a while. A fine bristled stainless steel brush like the Dremel mini end brush would be a good choice. A brass brush would be a bad choice. Brass is a soft metal and the bristles of a brass brush can easily get caught between the tubes and break off.
When you brush the face of a torch, just "sweep" it. Don't scrub it.
Lots of things can cause sparklies in the flame. Dust is a commom cause of sparklies. A fun thing to do is to wear a T shirt and sit behind the torch with it running and then "pop" your shirt (you know, pinch it in front, pull it out, and then let it go back).
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