API Developers. If you are a Google Apps API developer and use ClientLogin authentication, after you enroll in 2-Step Verification, you'll need to use an application-specific password in place of your regular password.
Answers. Best Answer: It's fine to reuse ear plugs as long as you clean your ears each time before inserting them. You'll need to replace them occasionally, depending on how often they're used. I've found that the yellow cylindrical ones work better and stay clean longer than the standard orange ones.
Common Cold. A viral infection of the nose is the most common cause. The nasal congestion also blocks the ear tube eustachian tube. The ear tube normally keeps air in the middle ear. Ear Infection. Middle ear pus can also cause muffled hearing on that side. This commonly happens with an ear infection. Middle Ear Fluid.