Rubio Monocoat Natural Soap 1 Liter For use on floors finished with Rubio Monocoat One liter of Natural Soap concentrate will make about 15 gallons of cleaning solution Cleans the floor and retains the natural matte finish. The first cleaning can be done 3 weeks after treatment with Monocoat Oil Plus. Surfaces treated with Monocoat Oil Plus can be cleaned weekly, if necessary, with a solution of  cup of Rubio Monocoat Natural Soap per gallon of water.