First step: Disable Cloud
Cloud is a Steam feature, which synchronizes all your local game data with a big online server. So no matter where on the planet you play a game via Steam, you will have everywhere the same game settings (like hot keys, sound settings etc.) By simply reinstalling Dota 2, those do not get reseted!!
So you go to Steam in the upper left corner > go on "Settings" > go on "Download and Cloud" > un-tick the Cloud function! Now cloud is disabled!