Yes, I simply wash them with soap and water. For hard to reach areas, a soft toothbrush is your friend
. This works for both stickiness and removing the white residue that sometimes builds up on a figure's surface. I literally wash my hands with lots of soap, then whilst they are still covered in soap, hold the figure in my hands and continue washing my hands with the figure cupped in my palms (take off any rings you might be wearing first to avoid risk of paint rubs or scratches). Do this for a minute or so, rinse the figure and check it for stickiness / residue. If it's still sticky, repeat the process. Use the toothbrush (whilst nice and soapy) to remove stickiness and residue from areas like folds in a figure's clothing, boot creases, etc.