It shall be unlawful for the owner or operator of any service station, abattoir, cleaning establishment, laundry, merchant, warehouse, wholesaler, garage, car dealer, used car dealer, or any other business licensed to do business in the City to permit water which is used in the conduct of such business to flow off the business premises onto the sidewalks or streets of the City. This Section is not intended to prohibit the reasonable use of water in cleaning business premises, but it is intended to apply to the use of water by the enumerated businesses for the purposes of cleaning merchandise held for sale, and it is also intended to apply to water used in the course of business for the purpose of cleaning property of customers of the said businesses.