The denim clothing washing processing method according to the present invention includes a step of preparing an immersion solution containing bio-cellulose, a fabric softener, silicone and purified water (s1), a denim clothing preparation step (s2), and an immersion step of immersing the prepared denim clothing in the immersion solution. (s3) and a rinsing and drying step (s4) of rinsing and drying the immersed denim clothing.
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