I know there are one or two products about for doing this but is there
a totally DIY way of doing it, i.e. is it possible with materials etc.
that I'm likely to have already?

I know basically what one needs is a *very* fine abrasive followed by
polishing - or even just polishing as that is just the next level of
fineness really. But what polishes etc. have I already got which
might work on plastic lenses? Would something like T-Cut be too
fierce?

--
Chris Green