Just an update for everyone trying to remove a subscription. I was trying to remove Clear Channel (Total Traffic Network) and also removing the ad version of Navteq.

I tried the instructions (actually suggestions) posted in this thread and they did not work. I travelled to a different part of the USA and I went into my traffic menu on my765T. I have some 15+ codes entered, most of which i entered invalid codes on purpose to overide the TTN sub. All the "codes" show up in the menu. There is no way to remove any of the subscription on my 765T. It looks like it may have to be done at Garmin's factory. I am not worrying about the Navteq sub and getting the ads removed since for the most part, TTN overides Navteq in my areas of travel.