I just add a big squirt (about once around the tub) to the cold soak water, let agitate for a bit, stop and let it soak overnight. Â It's quite amazing the next morning, when all you smell is the bac-out in the washer. Â I don't add it to hot water because I've heard that kills the enzymes. Â I also keep a spray bottle diluted with 1/2 water to spray directly onto dipes that may need a little extra help.
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I don't add detergent until my hot wash. Â I do an extra rinse.
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So it's:
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Cold soak w/ Bac-out
Hot wash w/ detergent
Extra rinse with vinegar