Which of the following is NOT a hydraulic cleaning method?

Lamping is not considered a hydraulic cleaning method, which is why it is the correct answer. Hydraulic cleaning methods primarily involve the use of water or other liquids to remove debris and build-up from pipelines or sewer systems. Flushing utilizes water flow to clear out sediments, and poly pigs (or pigging) also use the movement of a device inserted into the pipes to clean and maintain the interior surfaces. Kites, in this context, are a type of device used for cleaning that relies on hydraulic principles as well.

In contrast, lamping refers to a different process that typically involves inspecting pipelines rather than cleaning them through hydraulic means. Therefore, it does not fit the category of hydraulic cleaning methods, making it the distinguishing choice in this question regarding cleaning techniques.