I buyed CS:GO and uninstalled Junkies version. Unfortunately I have non-steam servers (Telekabel Junkies...)in game menu. How completely uninstall the game?

uninstall with the uninstall file then delete the remaing files.

I did this but I still have this problem. Maybe registry file from first junkies patch caused this problem. Now my question. How to find this registry file and delete it?

You can do that:
1. Enter registry by pressing WIN+R and typing "regedit"

2. Click on Computer from top of the list at left side and press ctrl+f.
3. This is searcher. Type in there just Global.
4. You got it. Just now delete it and reinstall Steam version or there is way to repair game files in Steam.

I hope helped you.