Expiration of washing powder can also be used?

You can. Just wash effect is poor.

Washing powder mainly of anionic surfactant, sodium alkyl benzene sulfonate, a small amount of non-ionic surface active agent, add some additives, phosphate, silicate, sodium sulphate, fluorescent agent, enzyme, etc. The process is made by mixing, powder spraying, etc. Now most use 4 a fluorspar instead of phosphate.

Alkali agent: under proper basicity, fiber and dirt can be maximally ionization, more easy to dirt hydrolysis and scattered. Usually contain soda ash and sodium silicate in detergent formulation, in which sodium silicate and characteristics of the suspended dirt particles, prevent redeposition.

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