Chemical solution proportioning method

A method of combining at least three liquids to form a solution mixture for soft washing a surface, comprising the steps of:

• providing at least three tanks capable of separately containing said at least three liquids;
• providing at least three first hoses each having a first end in fluid flow connection to a separate one of each of said at least three tanks;
• providing a proportioning device connected to a second downstream end of each of said at least three first hoses, comprising;
• at least three passageways each connected to a separate one of said at least three first hoses;
• wherein said at least three passageways have a length, an axis and are at least three separate and distinct channels, wherein said length of said at least three passageways are equal, and said at least three passageways each including an entry end and an exit end;
• a manifold fluidly connected to the exit end of each of said at least three passageways;
• wherein said manifold is a hollow housing for receiving said at least three liquids direct from said at least three passageways simultaneously to form said solution mixture;
• wherein each of said at least three passageways have a first valve and a second valve which separate said at least three passageways into a first chamber before said first valve, a second chamber between said first valve and said second valve and a third chamber after said second valve;
• wherein said first valve is aligned on said axis of said at least three passageways with said second valve;
• and
• wherein each of said chambers is an enclosed cavity within said at least three passageways of said proportioning device;
• providing a second hose connected at a first, upstream end to said manifold;
• providing a pump connected to a second, downstream end of said second hose, such that said pump is capable of causing a negative pressure within said manifold of said proportioning device to pull each of the three liquids from the at least three tanks and causing each of the at least three liquids to separately flow through the at least three passageways;
• providing a nozzle for discharging the solution mixture in a pressurized sprayed jet stream;
• providing a third hose connected to said pump and said nozzle;
• calibrating said first valve of each of said at least three passageways according to a range of flow rates of each of the at least three liquids flowing through the at least three passageways;
• and
• manually adjusting said first valve to a set position in each of said at least three passageways, whereby said set position of each of said first valves controls the flow rate of each of said at least three liquids, thereby controlling the proportion of each of said at least three liquids entering into said manifold according to a preset ratio determined by said set position of each of said first valves to form said solution mixture for discharge from the nozzle in the pressurized sprayed jet stream for application to the surface being soft washed.