The principles of detergency involving surfactants lowering surface tension and producing foams or froths to aid in cleaning and dirt suspension are fundamental and widely observed facts of everyday chemistry, requiring no special citation.
The claim describes basic chemical and physical properties of cleaning agents and surfactants (lowering surface tension and foam/froth formation assisting in dirt removal), which represent everyday scientific observations and standard educational principles. Per the prompt instructions, trivially true statements and direct everyday observations are classified as common knowledge, so no citations or evidence weighting are needed.