Bushido

Hi, I have noticed that every time, when CCleaner cleans, then after PC is restarted, Windows 10 Mail app says that @Hotmail/@Gmail account credentials are out of date. What exactly CCleaner deletes that brings up these messages? I clean my PC weekly and I have to re-enter @Hotmail/@Gmail passwords every week. I have also @windowslive.com account in Mail app and this account's login credentials are not affected by CCleaner cleaning. It is frustrating to re-enter passwords every week.