Clean (2004)

Maynard Yates is trying to clean up his life when chance gives him a job as a limousine driver. He is soon chauffeuring the Hollywood elite and finds himself emerged in the dark, seedy underbelly of celebrity: sex, addiction, money, fame, greed, lies, power and betrayal. When his own bad habits return, Maynard is unwillingly led into a downward spiral and slowly realizes that he may be the driver but he's not in control.

Unfortunately the movie Clean is not yet available on HBO Max.