If the noise is lower, the AC service may be the cause. Magnetic fields from transformers can cause humming. Mains transformers typically cause an AC magnetic field around them. This magnetic field can be copled to wiring, electronics or signal transformers and cause humming.
Baby oil can be used for removing makeup. Pour a few drops of it on a cotton ball and gently wipe the makeup off your face. Rinse your hands, face with cold water, and dry the skin using a soft towel. Baby oil removes all of the makeup without harming your skin.
Being in such a delicate area, perhaps diluting the oil with almond oil or jojoba oil would be wise. Just 2 to 3 drops of almond oil per drop of helichrysum would probably do it. The oil will still penetrate. The blend Gentle Baby is used by many mothers after giving birth for reducing scars and stretch marks.