Patent ID: 7364627

Claim:
A method of controlling concrete washout, comprising: providing a portable concrete washout container with a plurality of constructed walls comprising first and second side-walls extending between first and second ends and a bottom, and with a plurality of inner wall surfaces, and also with a substantially open and un-covered top; applying a release material to at least one of said plurality of inner wall surfaces of said container; wherein said release material comprises a solid material liner which is resistant to an adherence of hardening concrete washout material; placing a volume of hardening concrete washout material in said container; allowing the volume of concrete washout material to substantially harden into a substantially hardened condition within the container; and allowing the volume of concrete washout material in the substantially hardened condition to separate from the solid material liner under its own weight and removing said volume of concrete washout material in the substantially hardened condition from said container through an opening at the second end by tilting the container with the first end above the second end.