Patent ID: 7159598

Claim:
A method of cleaning an inner surface of a tank, comprising the steps of: a. providing a supply of liquid cleaner solution; b. dispensing said liquid cleaner solution into the tank to create a pool of said liquid cleaner solution within the tank; c. providing a first spray head for dispensing said liquid cleaner solution under pressure in a fine mist; d. disposing said first spray head in the tank above the pool of liquid cleaner solution and in operable closed loop fluid communication with said pool of liquid cleaner solution; e. heating said liquid cleaner solution; f. dispersing said liquid cleaner solution under pressure through said first spray head in a heated fine liquid spray mist and covering the inner surface of the tank above the pool of said liquid cleaner solution with a said heated fine liquid spray mist of said liquid cleaner solution; g. providing a second spray head for dispensing said liquid cleaner solution in a controlled high pressure liquid jet stream; h. disposing said second spray head in the tank above the pool of said liquid cleaner solution and in operable fluid communication with said pool of liquid cleaner solution; i. dispensing said liquid cleaner solution from said second spray head after the step of dispersing said liquid cleaner solution through said first spray head, to impinge the inner surface of the tank with a controlled high pressure jet stream of said liquid cleaner solution; and j. rinsing said liquid cleaner solution from said tank.