Posted By
MIK
on 2014-04-09
14:55:43
 |  Re: Wanted 1551 in The Netherlands :-) And pic of my 264 stuf
Try a little bit of liquid glass cleaner on the box, like this one:
http://www.amazon.co.uk/Windolene-Trigger-Spray-500-Pack/dp/B0082AA2QW/
Make sure it cleans with vinegar and not water!
Just put a drop on a kitchen towel and rub gently over the dirt and on the colour printed area only. The printed surface is coated to protect it from minor dirt and damage so it won't soak in when cleaning lightly unless the cardboard it's self is exposed, but keep in mind it's still cardboard and keep away from the edges and non-printed surfaces. Take your time.
You might even be amazed when you start cleaning, the colours come back into the print and how it used to look 30 years ago! 
With a bit of luck that stain will come off, it's transparent so fingers crossed!
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