I use white vinegar with essential oils for fabric softener. I put cedarwood oil in to keep bugs out of our clothes. It works! I'm not sure how it would work with commercial detergent- I made the switch to homemade fabric softener at the same time that I made the switch to homemade laundry powder.
I also use lavender and eucalyptus oils in fabric softener, but I'm going to try this citrus peel setup. Right now, I put citrus peels in a pot of water on the stove, and it cleans up the smell of our house. (I find potpourri cloying, the citrus is fresher smell. I also have baking soda, incense, and candles, but I don't buy commercial air fresheners. Bleh.)
I don't use conditioner, so I won't buy that just to put it in. (Shampoo bar + 50% ACV-50% green tea rinse. Coconut oil on the ends *before* washing, and only when they are really dry. And yes, I have long, very thick hair and this works just fine once the transitional period is over.)