On Mon, 13 Jul 2009 22:57:13 +0100, Peter Parry had
this to say:

On Mon, 13 Jul 2009 21:53:12 +0100, "john jardine"
wrote:


I'd suggest buying a gallon of "Cellulose paint thinners" from the car
spares shop (£7). The stuff's an aggressive solvent and you need to be quick
on cheap plastic surfaces but it'll quickly do the job.

Acetone (Cellulose thinners) dissolves many plastics instantly and is
a last resort. Most felt tip will dissolve in white spirit, which in
turn is safe on most plastics and paint surfaces so try that first on
the hard surfaces.

Trichlorethylene may also be suitable, and it's relatively innocuous,
if used sensibly.

--
Frank Erskine