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it depends on the materials itself... especially the plasticizers... it may or may not happen... but i wouldn't want to discover which of my figures can or can't the hard way...

there's actually a letter made by a staff from GSC about airing the figures out of their boxes so that the fumes from it will not have a reaction to the plastic packaging... but i forgot where to find it... i think i read somewhere from another GSC staff's blog...

http://mikatan.goodsmile.info/en/2012/10/18/kuroyagi-san%E2%80%99s-letter-corner-number-65/

somewhere in there... search for "damage"...

what i do with mine is keep them in display cases with tiny ventilation holes on its base...

should the sticky phenomenon did happen... i tried this to my stickyfied snorlax figurine...

have 2 basins (i used disposable food containers)...

fill them with water...

add a mild dishwashing liquid in one of the basins... it would be helpful if it's a degreaser kind of dishwashing liquid... as long as it's mild...

dip your figure for about 20 minutes in it...

then dip it on the one without the dishwashing liquid... for about 10-20minutes... we're just rinsing it by this process... i mean... without touching the plastics... because some figure surfaces are easily tainted when rubbed even by fingerprints... especially ones that has a fluffy soft appearance... mostly the surfaces that mimics skin... they became unrealistically un-matte when you try cleaning it with your fingers or cotton...

if it's impossible to clean it without rubbing... like it's too oily and dirt already got into the surface... one suggests the use of microfiber cloth to rub the dirt off...

when drying the figure with a cloth... always pat... do not rub...

leave it in the open to dry before storing... to prevent fungal growth...