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 benefits: ear. Mineral or baby oil is good from treating common ear problems, such as wax build-up. For those that are hard of hearing, we recommend using a few drops of heated baby oil before going to your ear specialist. Then pour the drops in your ear, keeping your head cocked. Hold for a few minutes.
1 Pour some baby oil on a clean cotton ball and then use it to clean your face and neck area. Once you are done, rinse your face properly with cool water and dab your skin dry with a soft cotton towel.  Use baby oil to get rid of the stickiness that lingers after waxing your hands and legs.