How to Delete a game completely then reinstall

[Lost in Space]

My Farming Simulator 15 game files are totally messed up. I have uninstalled/reinstalled it 6 times but it stays locked into old files that are hidden somewhere that keep it from working right. Is there a way to completely remove the game and all it's subsidary files on my PC so that I can reinstall it clean and fresh? I've tried every way I know of to fix it and nothing works. Thanks.

[Vaulty]

Uninstall game > Goto: C:\Program Files (x86)\Steam\steamapps\common > Find Farming Simulator 15 > Delete it > Install game again

[Lost in Space]

Thanks VAult hunter. I deleted that entire folder but the game reloaded with no changes In other words, it still does not see any of the mods in the Mods folder. This is frustrating. I guess the next step is to delete that same folder you mentioned again, and also delete the entire FS15 folder : This PC> My Documents > My Games> FarmingSimulator2015 as well. They are different. Wish me luck. Something is gonna fix this problem.

[B l u e b e r r y P o p t a r t]

Also do you have any cleaning sotfware like CCleaner, it helps a bit after deleting something as something might be lingering around.

[Lost in Space]

Another great suggestion. Yes, I have CCleaner and just ran it. When I delete the game and reinstall it the message pops up: "the file game.xml in the directory is newer than the version in the profile path. Do you want to replace the profile file game.xml with the one in the program directory?" yes or no. Since I want to delete everything from my computer, which one should I pick?