1. Plug your sink drain, and fill it with lukewarm water and the sustainable detergent of your choice.
Lukewarm water is very important-- Water that is too hot can damage your delicates! Not to mention, lukewarm water is much more environmentally-friendly than boiling hot: it uses much less energy! Around 2-3 tablespoons of detergent is usually the sweet spot for your delicates, but feel free to play around the first few times to figure out what is the perfect fit for your underthings.
2. Swish your underwear around to loosen any dirt, and let soak for no more than an hour.
Handle them in the water throughout the hour by pushing them down, swishing the water around them, and turning them inside out to make sure the water is getting in all of the nooks and crannies, the dirt and grime will be separated from your underwear. DO NOT rub or squeeze them.
3. Rinse with cold water and drain them by pressing them firmly against the side of the sink, then roll up into a clean, dry towel to remove excess moisture.
4. Hang or lay flat to dry on a second, dry towel.