Once resin is
CURED it's cured , despite what's being told....think about it, if moisture could indeed re activate the resin, then any amount of moisture present in paint, glue, accelerator, humidity, sweaty fingers etc. could be detrimental to the over all condition of the resin piece......same thing could also be said with using alcohol / lacquer thinner/ acetone as there is amounts of water in those as well. The only thing that can cause resin, whether its polyurethane or epoxy , to change its state,density or properties..... which ever term you want to use... is
excessive heat .......Alumilite, for an example, starts to deform @ 425 degrees f. If excessive pressure is applied to the piece, it may start to give way @ 250 to 275 degrees f.
What needs to be cleaned from the part or pieces is the either the mold release or any oils released from the rubber mold since it is petroleum based RTV silicone, if that type of mold was used.
Full disclosure...I use Alumilite mold making and casting products exclusively...have been for a few years....I clean my parts with warm water and Dawn dish washing soap (to cut any oils) .... never have had
ANY issues so far with that method. I have also done the alcohol / lacquer thinner/ acetone/ mineral spirits wipe down... what evers handy at the time...results where the same as warm water and Dawn dish washing soap.
This link goes into a little bit more detail:
http://www.resinparts.com/working-with-resin.html