Molding containers

A method of making a plurality of unit-dose ware-washing products each comprising an upwardly open container having a base wall, an upright perimeter wall, and an upright internal wall between one part of the perimeter wall and another part of the perimeter wall, the internal wall and the perimeter wall forming first and second compartments within the container, wherein the method comprises:

• injecting a molten water-soluble polymer comprising polyvinyl alcohol, polyvinyl alcohol copolymer, or partially hydrolyzed polyvinyl acetate into a mould cavity between cooperating male and female mould parts;
• wherein there is an independently movable first male mould part and an independently movable second male mould part separated by a gap in which the internal wall is formed;
• wherein the first and second male mould parts are independently movable with respect to one another and correspond to the first and second compartments of the container to be formed;
• wherein the surfaces of the first and second male mould parts that define the gap in which the internal wall is formed are fully accessible by virtue of the first male mould part being fully withdrawn before the second male mould part is withdrawn from the female mould part, and
• introducing different compositions effective in cleaning into respective compartments;
• and
• closing the container;
• wherein the method comprises, before the injection moulding of at least one of the containers, smoothing all the polymer-contacting surfaces of the first and second male mould parts.