I notice that during washing or drying clothes the socks get esconced inside the folds of other clothes or towels...when drying the statis electricity holds the socks in position. A place to find socks is the inside of the arms of shirts...jackets....sweatshirts..since most people dont check the insides jacket arms...they womt find those socks for a long time..just my theory.
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Everybody knows it’s the “Sock Gnomes” to steal peoples’ socks.
I always double rinse. The first rinse contains vinegar which seems to dislodge more dirt and left over soap. The second rinse flushes any residual soap, dirt or vinegar leaving the laundry fresh and cleaner smelling. Once in a while I will use a bit of baking soda in the second rinse if someone got BO as a result of deoderant failure or case of nerves. My water tends to be a bit hard and I think the additional vinegar helps to let the soap work better.
I am allergic to fabric softener, but the technique I use seems to soften the clothes and keeps stiffness at Bay because of getting the soap out. I like to hang laundry on the line..sunshine santizes..love the smell of the laundry. Energy efficient, too.