How to distinguish detergent true or false

With soft water test. Natural precipitation (rain, snow, etc.) can be considered as soft water. Get some washing powder, in a moderate amount of soft water, stirring, if there is a lot of foam, can be considered to be true, otherwise false.

Easy to dissolve, rich bubble, wash clean, do not hurt the hand, and so on.

Directly to the washing powder rub with both hands, will try to feel a burning, burning sensation is true, false otherwise. And spilled the washing powder into the water, look have a bubble, it was true, false otherwise.

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