The cleaner movie!

Yesterday i watched a film called the cleaner, just by hearing the name you can imagine that it's a movie about crime scenes.
The main actor is Samuel Jackson who is a former policeman, the owner of a cleaning company, and cleans all the crime scenes.
One day he receives an order to clean a mansion, as nobody is available at the moment he decides to do the job. He arrives at the place and ring the belt, nobody answers and he sees a note on the service order that says that the key is under the plant pot. He opens the door and go to the living room. All the place is full of goagulated blood , there are stains on the couch, window , floor, and wall. As a normal procedure he takes pictures and records his voice saying how the crime scene is. He clean all the mess up and go back home.
The next day he goes back to that mansion to give the key back to the owner and talks to the wife of the death, she apparently doesn't know anything about the cleaning service nor the death of her husband, so he decides not to tell her the true and goes back to the office. He knows that something is wrong, so he calls to the police and asks for the name of the detective who pay for the service and He's said that any detective with that name doesn't work there.
The day after the wife of the death goes to the office to talk to Samuel and he tells fibs again.
After some days Samuel Jackson tells his police friend about what happened that day and he promises to help him.
Samuel is under a lot of pressure because the homicides detectives find some cleaning products in the scene of crime so he's asked about that and he decides to talk to the wife of the death about what happened that day and not to make the story longer he search for all the clues so that he wouldn't be guilty for the homicide and realized that his police friend and the wife of the death are lovers and his police friend kills the husband of hers.
At the end the police friend and Samuel are arguing in Samuel's house where is his daughter, the police point the gun to Samuel and Samuel's daugther shots the police.
The policeman is kill and Samuel and his daugher alive. The last scene of the movie is a cleaning worker cleaning Samuel's house.