

Why does it take so long to dry your clothing that mildew can grow? Take it out of the machine as soon as its done, don’t dry it in a sauna?
I would guess that citric acid will cause damage, but realistically there shouldn’t be any detergent or chemicals left over after a washing cycle anyway. The final rinse should clear it completely.







As others have alluded to, you probably need to get the drying time down, and mechanically removing the water is your best bet (mangle or separate spin dry). Your additional rinse might make it worse if the dry time increases.
One way to get the water out, if spin cycle or mangle isn’t an option is to layer your clothes in dry towels, roll them up and wring out the towel. You still need a way to dry the towel, but it will get a lot of water out of the clothes.