A cleaning tank apparatus and methods for cleaning workpieces are described. The cleaning tank may include an outlet plate having a top edge and a bottom edge, with the outlet plate having a plurality of rows of outlet openings. The plurality of rows of outlet openings including a first row of outlet openings being closest to the top edge of the outlet plate, and a second row of outlet openings below the first row of outlet openings, wherein at least one of the outlet openings of the first row is larger than the outlet openings of the second row.