Have just acquired some old LGB coaches which may have been manufactured in
> polypropolene or similar plastic. They are very dirty. Can anyone let me
> know the best way to clean them without damage?
> Thanks.
> John
>
>
I used 1/2 diluted swarfega to clean an old model aeroplane kit. 'Painted' it all over, left it over night, then scrubbed off the next morning.