Hey scotty

i drive a 2010 Lexus is250 and I replaced all 4 rotors and all sets of brake pads 3 days ago. I noticed a loud squeak from the front right tire when I would brake. I took out the pads and cleaned them thoroughly with rubbing alcohol, cleaned the rotors with brake cleaner and lubricated the non-friction side of the brake pads. This fixed the loud squeak on the front right brakes. I then noticed that my rear brakes would squeak when I turned. So I did the same thing to all 4 sets of brake pads being sure to wear gloves and keep everything very clean. To my disappointment, the rear brakes still squeak when I turn and I’m not pressing on the brake. What could be causing this?? Thank you