有皂垢是正常的吗？
Is it normal to have soap scum?绝大多数洁面产品中，都含有皂基（皂类界面活性剂）。当遇到自来水中的钙、镁金属离子时容易产生皂垢，常以为洗干净了的涩涩的 "清爽感" ，其实是手、水和皂垢摩擦产生的一种错觉。所以，洗干净的纯净皮肤，怎么可能摸起来涩涩的。软水滑滑的，是不会有皂垢残留的，洗时滑溜溜，洗后皮肤水嫩嫩、滑顺。这与用含化学清洁产品洗完后的滑腻感、膜感，无法相提并论。其实，皂垢就是肌肤的隐形杀手，如果是使用化学合成洗剂、洗发精、洗面乳、沐浴乳，皂垢会越积越多，不断沉积在皮肤上。
The vast majority of cleansing products contain soap-based (soap-like surfactant) ingredients. When these ingredients encounter calcium and magnesium ions in tap water, they can create soap scum, which can create a "refreshing" sensation that is often mistaken for clean skin. However, this sensation is actually the result of the friction between your hands, water, and soap scum. Clean, pure skin should not feel rough or gritty. Soft water, which does not contain as many minerals, will not leave behind soap scum. When you use soft water to wash, your skin will feel smooth and soft, with no residue. This is in contrast to the slippery, filmy feeling you may get from using chemical cleaning products. Soap scum is actually a hidden danger to your skin, especially if you use synthetic chemical detergents, shampoos, cleansers, or body washes, as it can accumulate and deposit on your skin over time.皂垢问题最主要形成问题是水质！一般好的手工皂加上好的水质是不会产生皂垢！所以，沐浴家中使用的水最好可以考虑采用离子交换树脂处理过的水较好！即软水比硬水（地下水或自来水）好！
The main cause of soap scum is water quality! A good handmade soap combined with good quality water will not produce soap scum. Therefore, it is recommended to use water treated with ion exchange resin, such as soft water is better than hard water (groundwater or tap water)!