只需按照以下4个步骤：
只要把8~10个无患子果实去掉种子留下皮(果肉)放入小棉拉绳袋。 不鏽锅放入三杯水，放入无患子皮的棉袋，煮沸腾约 15分钟。 (这一过程将从无患子果肉中提取的皂素，创造出肥皂。) 关掉瓦斯炉后，等锅子和液体冷却，再取出无患子皮的棉袋。 将液体倒入瓶中保存。
自制无患子洗发水并不像商店购买的洗发水。别担心，这个方式会让你的头发自然清洁也可兼作沐浴露。
如果这是你第一次使用无患子洗发水，你会发现需要一段适应期，你的头发会需要一点时间来调整。
给它一个星期左右，你的头发自己会调整恢复。如果你使用太多了，你会发现，你的头发将比较乾燥。只需使用在下一次用量减少一点，你的头发将会自己平衡。
以上用google翻译后编修。
PS:
1.美国食谱中常写的一杯水，料理常用单位换算是约240cc。
2.无患子diy的产品，不要太阳直晒。放入冰箱冷藏可保存约一个月，室温约2星期，国外也有做多一些分装冷冻.一罐用完再解冻，也有人会冷冻无患子液成像冰块一块块，要洗衣服在丢入洗衣机中让水溶化结冻的无患子液。
3.无患子皮的棉袋可继续当洗手袋或清洗流理台。直到失去发泡性就可丢噜。
4.无患子产品不建议用在洗纯白的东西，因会有染色的问题。
摘录自
Soapberry Shampoo and Soapnut Bodywash
I was amazed after I learned this recipe!It is so simple! Just follow these 4 steps:
Simply place 8-10 soap nut skins in a small cotton drawstring bag. Fill a pot with 3 cups of water, add the cotton bag and boil for around 15 minutes. This process willextract the saponin from the soap nut skins, creating a soapy base. Take the pot off of the hot stove and allow it to cool before removing the cotton bag. Pour the liquid into a suitable dispensing bottle.
Homemadesoapnutshampoo is not as thick as store bought y not, this recipe will leave your hair naturally clean and can double as bodywash.
If this is your first time usingsoap nut shampoo, you will find that a little goes a long way and that your hair will take a little time to it about a week and your hair will adjust on it’s you use too much, you will find that your hair will dry use less next time and your hair will balance out.
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