outward direction to spread the cleaning material in an efficient manner to a large area of the rod to be cleaned nozzles for use in cryogenic blasting are known in the art such nozzles can be found in u s pat nos 5 018 667 5 660 580 and 8 187 057 each of which are specifically incorporated by reference in their entirety in embodiments concerning the application of the cryogenic liquid to the rod the cryogenic liquid is pressurized such that it contacts the rod at a desired speed the pressure can be any pressure contemplated that propels the cleaning material to the rod in certain embodiments the pressure is 10 psi 20 psi 30 psi 40 psi 50 psi 60 psi 70 psi 80 psi 90 psi 100 200 300 400 500 600 700 800 900 1000 or more psi in certain embodiments the cryogenic liquids impacting a sucker rod or other pump rod surface with contaminants remove contaminates in one of three ways via kinetic energy via thermal shock or via a thermal kinetic effect in embodiments wherein the cryogenic liquid removes the contaminants via kinetic energy the energy of the accelerated cryogenic liquid is transferred as it hits the surface of the rod to be cleaned during the blasting process this is akin to a pressure washing effect however in some applications a high pressure cryogenic liquid is not used likewise thermal shock occurs when certain cryogenic liquids strike a much warmer contaminated surface during the blasting process the cold temperature of the cryogenic liquid causes the bond between the surface being cleaned and the contaminants to weaken this effect aids in the release of the contaminant when struck by the liquid during the blasting process the thermal.