I have some apps like tweego that saved my password. And it seems like it saved my password appearing to be hidden, but if you close the keyboard and use the virtual keyboard, it'll display the password. I'm somewhat self conscious that anyone could easily accidentally see my password. I Tried reinstalling it, but it still have my information.

I was wondering could I clear it if i went into "settings" then click the drop down menu at the top, using "clear device" would clear app data like this, and what exactly would it delete.

Also I sent my general password to my sister one via text message, and so now it's built into the predictive text dictionary, is there anyway to clear that, flashing it seems a little overboard