A wiper (22, 960) has a length (L) which is divided into a distal segment (D), a middle segment (M) and a proximal segment (P). Wiper (22) has first and second wiper blades (26, 28), defining therebetween a channel (30); wiper (960) has a longitudinal enclosed tubular channel (964) formed in central portion (962). One or both of the blades (26, 28), or at least one side of central portion (962), have one-way water-passage formations thereon along the middle segment (M) of the length (L) thereof. Such formations, e.g., notches (34, 36, 986a, 986b), are dimensioned and configured to permit passage of water therethrough to the channel (30, 964) when the wiper (22, 960) is moving in a first direction, and to prevent passage of water therethrough when the wiper (22, 960) is moving in a second direction opposite to the first direction. A method of wiping a surface (S) includes controlled entry of water into the channel (30) and expulsion of water from the distal end (42) of the channel, assisted by a Venturi Effect and centrifugal force.
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