I've never taken a shower using scent free shampoo/soap. I wear ScentLok clothing most of the time while bowhunting. All other hunting clothing is washed in scentfree detergent. Anytime I head to the woods or blind, I always spray generous amounts of HS Scent-a-way sprays (mostly the non-scented spray) on my clothing, hats, gloves, boots, bow, and other gear before walking in. I will also use the HS scent wafers as cover scents.
IMO, it's impossible to eliminate 100% of the human scent that you will have with you in the woods. Using the scent blocking clothing, scentfree detergents, shampoos, soaps, sprays, and cover scents all help to get you as close to that 100% elimination as possible. But nothing can substitute playing the wind and thermals properly.