I wash my stuff in scent-elim. to ! But I strongly believe that scent lok and scent blocker and so on is a marketing sceme . for being in the service I know that most of these companies got the idea from the military's coal lined N(nuclear) B(biological) C(chemical) protective suits. NBC for short. I have talked with some friends that deal with that part of army and asked them if it really works. They said it could. but when you wash it is no good. it breaks downthe integrity of the lining.coal lining is not intended to be washed and recharged in the dryer.just thrown away.
Myself I think you have to play the wind(A big must), careful not to contaminate the area by walking all over where are setting a stand and so on. Deer are very smart. they seem to know when a leaf is out of place in a tree. one thing is for sure that I have learned is not to be over dressed walking out to the stand. otherwise you sweat like a pig. and you might as well start doing the jig in your stand so everybody can see you.
I've also heard of people smoking in there stand and they see deer. But deer do get curious to.