Question

why does the skin of out fingers shrink when we wash clotjes for long time ?

Answer 1

Because of osmosis between our hands and the soap water. As in osmosis the water moves to higher  concentration from lower concentration. The concentration of soap water is higher than the concentration of blood so our fingers shrink when we wash clothes for long time.

Answer 2

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When we wash clothes, our hands are exposed to water for a long time. Our hands behave as a hypertonic solution and the outside of our hands behave as a hypotonic solution. ... So actually the water is not absorbed here just leaving and thus it shrinks.