We have had a HUGE amount of sucess with a product made by American Polywater. This link is to a product called Cable Free: http://www.polywater.com/cablfree.html
This is a link to a .pdf on how it is to be used: http://www.polywater.com/cablefree.pdf
We had a huge pullbox, and about 20 conduits in and 20 out, each with at least 1 network of #12 THW CU, +/- 120' each direction. You could see the dried wire lube. We tried pulling these dry, and just wore ourselves out. After applying the Cable Free, and letting it sit overnight, only minimal effort was needed to recover all the wire. We have an unwritten policy of sharing the proceeds of such rabbit among the crew, or at least to buy lunch depanding on the amount. On occassion, a deserving apprentice gets the proceeds. Anyway, it was a nice reward.