Do you know Google Authenticator? I hope you do, because it is really key to increase security for your Google account.
You can read more about it on Wikipedia or on Google website. Anyway it is really good way to secure your other services as well. For instance LastPass is using Google Authenticator to two-step authentication, which will allow you to increase security of your WordPress. You can even install WordPress Plugin called Google Authenticator. I was using it for one week but I removed it after all - it was exaggeration IMHO.
Anyway - I was fighting with Internet because I didn’t know how to remove certain “account” from application.
In short words you just need to hold on account you want to remove and click on bin.