From the childhood I was asked to wash my legs properly without any dry space in my legs its true if it is happened that Shani dev's gaze should be impacted on ourselves. I couldn't find any scriptures instead some old movies had this.
Yes, this is true. Shani enters thru dry/unwet space. Saturn signifies infections, bacteria, and virus, etc. So when one goes out and comes back to home, brings tons of virus, bacteria to home thru their legs, hands, hair etc. And if one enters home and uses sofa, bed, etc. without a proper wash of legs, hands, etc. the microbe enters the human body, and other furniture like sofa, bed, pillows, etc, and enters every person whoever uses them, and causes diseases and misfortune to all family persons. This affects decision making capabilities and thus causes financial loses, and problems in career. This entire issue is named after the planet Shani who signifies the root cause for misfortune.
There is no need of mantra, tantra, yantra, scriptures, vedic texts, ancient evidences, etc. to understand and know this simple fact.