I alway wash and lube pellets, you won't belive the junk left in the baggy when your done cleaning them.
The way I do it is a zip lock baggy and mineral spirits, dump the pellets in the baggy and a little mineral spirits and slosh them around awhile, take them out and place them on paper towels and dry.
Take another baggy and put 6 or 7 drops of napier pellet lube and shake them up for a minute or two and you have nice clean and lubed pellets. I use the lube baggy over and over, the Napier I get from Gander Mountian, they stock it, at least they do here anyway.