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Okay, I searched for it, but didn't find anything about it. I've never worked with resin before, so I'm a total newbie with the stuff. I've read many times that you have to clean it before using it (and in the case of GW Finecast, repair it). So, what is the best way to go about prepping resin parts? Do I just run them under the sink with cold water and hand soap? And what happens if I were to try using the parts without cleaning them first? Does it just make it more difficult for the glue and paints to adhere?

Yep - just wash them with water (cool not hot in order to prevent from warping them) and regular dish soap.

Rinse with clean water and leave to dry. You can also rinse with alcohol if you are in a hurry. The alcohol will displace the water and evaporate in a matter of minutes to let you get right to work.

Not washing parts will depend on the manufacturers process. Most use some form of mold release in order to make pulling the objects easier and to help protect the molds. Mold release can interfere with glues and paints - so if you don't wash them, you can have issues in assembly and finishing.

When I work with resin, I always check all the parts for quality issues (miscasting or warpage) and soak them for about half an hour in undiluted Simple Green. Then I take an old toothbrush to the parts and rinse them in cool water and wrap them in a paper towel to dry. Once that's done, I use Liquid Green Stuff to repair small pits and the like and then I assemble using superglue and pins if I think the part needs it. Most small parts won't need it.