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.
The difference between regular mineral oil and baby oil is that baby oil has a fragrance added to it. If you're sensitive to fragrances I don't suggest baby oil. It can be used to treat mild eczema when corticosteroids are not desirable and also to clean ears ( 2-3 drops). Although mineral oil's main benefit is to sit on top of skin ( as occlusives do to prevent water loss).