google nefunguje dnes vsak?
Tools/Options.../Privacy.... you will see the tab clear history.
http://www.wikihow.com/Delete-Messages-on-Skype
http://www.youtube.com/watch?v=ekjzKyM_1ck
http://features.en.softonic.com/how-to-delete-chat -history-in-skype
atd atd atd