Hello and welcome to LQ.
At least one of the big distro's has a way to boot time option to a special mode where it won't save anything. I get the feeling it is OpenSuse but can't recall where I saw it.
If you have linux installed then there are a number of places that all this might be located. Just what all do you want to erase.
Last edited by jefro; 09-08-2016 at 04:24 PM.