Motorbike wash comprising: - a washing booth for accommodating a motor vehicle to be washed wherein first, second and third distributing nozzles (7a, 7b, 7c) are active for distributing washing liquids, osmotic water with detergent and osmotic water with wax, respectively; - means for collecting the washing liquids and/or osmotic water with detergent and/or osmotic water with wax distributed by the distributing nozzles (7a, 7b, 7c) comprising a recirculation pump; - a first tank of accumulation of washing liquids for washing operations in said washing booth, said first tank being intended to be supplied by water network and being in fluid communication with said first distributing nozzles; - first filtering means; characterized in that the motorbike wash further comprises: - a second tank of accumulation of the washing liquids of recirculation from said washing booth, said second tank being supplied by said recirculation pump and being in fluid communication with said first tank upon passage in said first filtering means, whereby said first tank receives the washing liquids coming from said second tank filtered by said first filtering means; - an osmotization circuit comprising at least one osmotic membrane unit (42, 42a, 42b) and a third tank of accumulation of osmotic water for deterging and/or waxing and/or rinsing operations in said washing booth, said third tank being in fluid communication with said second and/or third distributing nozzles (7b, 7c); wherein said first tank of accumulation of washing liquids is supplied by water discarded by said at least one osmotic membrane unit (42, 42a, 42b) of said osmotization circuit. - a washing booth for accommodating a motor vehicle to be washed wherein first, second and third distributing nozzles (7a, 7b, 7c) are active for distributing washing liquids, osmotic water with detergent and osmotic water with wax, respectively; - means for collecting the washing liquids and/or osmotic water with detergent and/or osmotic water with wax distributed by the distributing nozzles (7a, 7b, 7c) comprising a recirculation pump; - a first tank of accumulation of washing liquids for washing operations in said washing booth, said first tank being intended to be supplied by water network and being in fluid communication with said first distributing nozzles; - first filtering means; characterized in that the motorbike wash further comprises: - a second tank of accumulation of the washing liquids of recirculation from said washing booth, said second tank being supplied by said recirculation pump and being in fluid communication with said first tank upon passage in said first filtering means, whereby said first tank receives the washing liquids coming from said second tank filtered by said first filtering means; - an osmotization circuit comprising at least one osmotic membrane unit (42, 42a, 42b) and a third tank of accumulation of osmotic water for deterging and/or waxing and/or rinsing operations in said washing booth, said third tank being in fluid communication with said second and/or third distributing nozzles (7b, 7c); - a second tank of accumulation of the washing liquids of recirculation from said washing booth, said second tank being supplied by said recirculation pump and being in fluid communication with said first tank upon passage in said first filtering means, whereby said first tank receives the washing liquids coming from said second tank filtered by said first filtering means; - an osmotization circuit comprising at least one osmotic membrane unit (42, 42a, 42b) and a third tank of accumulation of osmotic water for deterging and/or waxing and/or rinsing operations in said washing booth, said third tank being in fluid communication with said second and/or third distributing nozzles (7b, 7c);