Vintage Pronil keychain – Textile after-wash treatment (1960s)

Vintage keychain shaped like a “Pronil” textile treatment box, in good condition, likely from the 1960s. Not a detergent, but a post-wash care product for delicate fibers, nylon, and natural silk — basically a spa serum for your socks. The slogan “Indispensable after washing” sounds like a sacred household mantra. Rare, kitschy, and delightfully absurd. Perfect for collectors or fans of domestic nostalgia.