Woddy's is the best I've tried. Plain old bar soap works fairly well. On my older full foam targets, I put used motor oil on the targets themselves. As the arrow goes through, it's self lubricating. Just wipe the arrows down with a rag and shampoo, then alcohol before using them for hunting.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol