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.
One of the benefits of lemongrass oil is that it is generally regarded as safe (GRAS). However this oil can cause extreme skin irritation therefore, dilution is highly recommended. Children under 18 month of age should not use this oil. If pregnant or under a doctor's care, consult your physician.