John Rumm wrote:

I will ask - I have a feeling that he just uses a (hard) rubber wheel on
its own. Having said that, most of the glass he is polishing is very
soft (i.e. 24% lead crystal).

I asked my FIL (http://www.bertcollis.co.uk/engrave.htm) about hard
glass (i.e. normal window glass) in particular, and this is the response:-

"Removing scratches from plain glass is a) difficult, B) tedious, c)
time consuming. To do it properly (ie successfully) one needs a set of
felt cones impregnated with diminishing sizes of polishing grits in
paste form.

Endless patience is essential. ( I have a small kit of polishes and felt
tips but not the patience!) Personally I only polish out engraving or
scratches if I am going to re engrave the affected area since one is of
course altering the surface level and thus the angles of reflection.
There is a man in Purleigh who specialises in repairing scratched or
broken glassware and he has a whole armoury of powered discs and belts."

So there you have it!

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/