Method for cleaning a surface by using rotating high pressure fluid streams

A method for cleaning dirt, grease, oxides or calcification from a surface or stripping the exterior layer of molecules from a surface comprising the steps of:

• applying separate rotating high pressure fluid streams from a single source onto the surface to be cleaned or stripped in at least two substantially circular concentric stream patterns;
• and
• cleaning or stripping entire areas of the surface between adjacent ones of the circular concentric stream patterns after the high pressure fluid streams initially impinge on the surface and as they are angularly deflected therefrom, said single source comprising a head adapted to be mounted on, and rotatable around, a high pressure fluid gun, said head having a longitudinal axis, a face with a center, and a fluid conduit therein, and at least two sets of jets on said face of said head, said jets communicating with said fluid conduit for passage of high pressure fluid through said head and said jets, each of said sets having at least one jet, each of said sets of jets being disposed at an acute angle from the longitudinal axis of said head, each of said sets of jets being disposed at a different distance from the center of said face, the distances of said sets of jets being selected such that rotation of said nozzle causes separate high pressure fluid streams from each of said sets of jets to impinge upon the surface to be cleaned or stripped in a number of substantially circular concentric jet stream patterns equivalent to the number of said sets of jets, the distances of said sets of jets from the center of said face further being selected such that the entire areas of the surface between adjacent ones of the circular concentric jet stream patterns are also cleaned or stripped by the high pressure fluid streams after they initially impinge on the surface and as they are angularly deflected therefrom, wherein the acute angle of each of said sets of jets is different than the acute angle of the others of said sets of jets and the different distances of said sets of jets are inversely proportional to the size of the acute angles of said sets of jets such that said set of jets having the largest angle is the shortest distance from the center of said face and said set of jets having the smallest angle is the greatest distance from the center of said face such that the separate high pressure fluid streams from each of said sets of jets first converge, then intersect, and finally diverge prior to impinging upon the surface to be cleaned or stripped.