Why do Muslims cleanse themselves for prayer?

For Muslims, the cleanliness is an important part of the religion, and Islam has many rules for both practical and ritual hygiene. Islamic hygiene includes the ritual washing of hands, feet, arms, legs, head and face before prayer or other religious acts, and hygiene measures for "impure" acts lavatory, intercourse, contact with dirty objects and so on. It also covers general hygienic maintenance of the body as regular bath, clipping nails and hair and so on