In this vid we show how to clean small portions of sticky cactus seeds. At the end we also show cleaning of dry seeds. This will in general also work for other species than cacti.
I found a good technique using a blender or Smoothie machine to collect the seeds. You add water and blend. The seeds are to small to get cut up so they collect on the bottom. Just pour out the pulp and add more water til water is clearof pulp and there is nothing but seeds and water on the bottom. Pour on a paper towel and let them dry and there you have it