a flushing fountain comprising a square fluid conduit having a mid line fluid flow barrier 32 flanked by conduit penetrating apertures 33 secured below the flushing fountain 31 by welding for example is square section c clip 34 having guide rails 36 at the distal ends of suspension walls 35 guide rails 36 confine and support the expendable blade elements of the invention which include a support body 40 to which blade cladding plates 41 and 42 are secured as by adhesive bonding compounds in support of a uniformly distributed flushing film over the blade surface support body 40 is machined or molded with stepped areas 43 and 44 to receive a corresponding area of cladding plates 41 and 42 separated by a spacing tongue 45 cladding plate material suitable to provide necessary stiffness and rigidity may be polished polycarbonate lexan whereas the support body 40 may be polymethylmethacrylante plexiglas more generally both plate and body materials should be of hard tough polymer that may be polished to an exceedingly smooth surface and is dimensionally stable both plate and body may be lexan or plexiglas between the two cladding plates 41 and 43 is a polytetrafluoroethylene teflon soft blade plate 46 having a blade edge 47 projecting 1 2 inch to 1 inch below the.