A detergent, alkali, acid or similar contamination removing material, which is usually water borne.

a detergent, it removes dirt and dust from the wood's surface

an abrasive product designed to remove fine layers of paint in order to renew dull paint, oxidation, dirt and old hardened wax

Cleaner is a chemical or device used to help remove soils.

Detergent, alkali, acid, solvent or any other material used to clean and degrease before the application of a coating.

Contamination removing material (detergent, alkali, acid...). Usually water borne.

In crime fiction a cleaner is a person who destroys or removes any incriminating evidence at the scene of a crime, typically a murder, as if the crime never happened. Knowledge of crime scene investigation is required, as well as an implacable manner as the perpetrator, who is usually agitated and confused, is inevitably involved with the cleanup.