US Patent 7402211 Cleaning chemical dispensing method

A cleaning chemical dispensing system includes: a liquid chemical additive having a predetermined viscosity; a mop bucket; a mop wringer provided on the bucket; a first indicator indicating a first volume of cleaning liquid in the bucket; and a reservoir for the additive, the reservoir positioned above the first indicator, and having a base, one or more upstanding walls continuously contiguous with and fully surrounding the base, an opening opposite the base for pouring the additive into the reservoir, a metering orifice in the base, and a second indicator indicating a second volume for the additive which corresponds to the first volume of the bucket so as to provide a required ratio of additive to cleaning liquid, the orifice being dimensioned to correspond to the predetermined viscosity of the additive, so that the additive can be poured into the reservoir before any significant amount of additive passes through the orifice.