I've used 20 Mule Team Borax for hunting clothes. It does not have any kind of fragrance added to it.
Add it to hot water then let it agitate a bit before you put your clothes in. I usually let the water cool off for a while before I put my clothes in.
I use Scent Killer Clothing Wash and Dead Down Wind Scent Prevent Laundry Detergent. Rural King usually has real good buys after Christmas. Thats when I buy.
I dont worry about it. Just get the wind right! Have you seen how many ppl smoke in their stand or drink coffee etc...? Why waste your dime? Hunt smart.