Need help with car rotaton

Unity Engine
1

I am making a game where a car rotates around a cylinder. When i press left mouse click the car rotates to the left and when i press right mouse click the car rotates to the right. What i want is when i release the buttons the car should rotate to point forward (to go back to center) along the cylinder and not get stuck to the left or right.

Reminder: It’s on cylinder and i do need a code, Thanks.

 rotation = Input.GetAxisRaw("Horizontal");
     rgb.MovePosition(rgb.position - transform.right * moveSpeed * Time.fixedDeltaTime);//move the car forward
     //rotating the car
             Vector3 yRot = Vector3.up * rotation * rotation_speed * Time.deltaTime;
             Quaternion deltaRot = Quaternion.Euler (yRot);
             Quaternion targetRot = rgb.rotation * deltaRot;
             rgb.MoveRotation (Quaternion.Slerp (rgb.rotation, targetRot, 50f * Time.fixedDeltaTime));
2

Does the cylinder rotate as well? I am not clear on what rotates around a cylinder means? Maybe you can set the Vector.forward of the car to be the same as the cylinder when the button is released

3

The cylinder does not rotate, the car is on cylinder and only the car goes around it and goes forward it’s easy, i just need the code when left and right is released the car to go to it’s center position.