I am working on cleaning up an older Ambassador. On Roy Lawler's web page, there is a picture of him "ragging" a horn to remove excess solder. Can anyone tell me what this cloth material is and where it can be purchased? I did send an email to Roy, but did not get an answer back--I'm sure he is busy, and I'm not comfortable flooding him with emails to ask what I feel is a trivial question. I'm looking for a way to clean out old lacquer and tarnish in the hard to get ringed areas around the valves and valve tubes. Thanks in advance for your answers.