It's a helper tool to reset tf2 to it's default settings... ( https://github.com/mastercoms/mastercomfig#clean-up )
list of actions:
- finds tf2's dir automatically
- moves
cfg
&custom
dir to a backup dir at/tf/backup_before_default/
- verify tf2's files
- disable current steam user's steam cloud for tf2 by cleaning the files at
STEAM_FOLDER/userdata/USER_ID/440/remote/cfg
- runs the game with
-novid -default -autoconfig +host_writeconfig +mat_savechanges +quit
- done
download at releases