Shampoo

Try DIY shampoo options made from baking soda/clay. You can find shampoo bars at zero waste shops and places like Lush. For short hair, no poo is a great option! Storage: A bar left in standing water will dissolve and degrade, potentially losing 30% of its lifespan. Always use a draining soap dish. Lathering Technique: Lathering the bar in your hands first, rather than rubbing it directly onto your head, can make it last twice as long. Travel: Bars are TSA-compliant and won't leak, saving you from buying expensive "travel-sized" liquid bottles.

https://www.reddit.com/r/NoPoo/