Which method is NOT one of the three different cleaning methods described in paint technology?

Brushing is not typically identified as one of the primary cleaning methods within the context of paint technology practice. The methods commonly cited include immersion, spraying, and ultrasonic cleaning.

Immersion cleaning involves submerging parts in a cleaning solution, which can effectively remove contaminants from complex geometries. Spraying refers to the application of cleaning agents in a mist or spray form, allowing for an even coverage on surfaces, especially those that are difficult to reach. Ultrasonic cleaning utilizes high-frequency sound waves in a liquid to create cavitation bubbles that clean surfaces by effectively removing dirt and contaminants in a gentle yet thorough manner.

Brushing, while it can be a method to clean surfaces, is generally not considered a formal cleaning method in paint technology due to its inability to uniformly cover all areas and its potential to cause scratches. Therefore, brushing does not fit into the standardized cleaning techniques typically discussed in this field.