Produced by detergent. _rot_

To find the missing word in the phrase "Produced by detergent. _rot_," we can approach it by deducing the possible letters for the missing word using the context.

From the context given, we understand that the missing word is likely related to being produced by detergent. We can think of common terms associated with detergents and their effects. One such term is "foam." Detergents often produce foam when agitated or mixed with water.

Therefore, the missing word might be "foam." So the completed phrase would be: "Produced by detergent. Foam"