Ever needed to clean up cloud saves in Steam? Although it is not possible to delete cloud saves you can intentionally corrupt the cloud save files to pretend they do not exist. Here is how: **
1. Get the ID of the game by finding the game on Steam store.** For example the URL http://store.steampowered.com/app/255710/Cities_Skylines/ indicates that the ID of Cities Skylines is 255710 **
2. Navigate to the Steam folder** (not the game install folder) on your hard drive (ususlly under C:). For example: C:\Program Files (x86)\Steam\userdata\YOUR_USER_ID\ **
3. Use the game ID to find the folder that matches.** For example C:\Program Files (x86)\Steam\userdata\106530865\255710 **
4. Run PowerShell window in the “remote” folder**
clc "C:\Program Files (x86)\Steam\userdata\106530865\255710\remote\*"
As we cannot simply remove the files we will have to “corrupt” them, making them empty, but still present. Although there are more steps, this did the trick for me. If it doesn’t work you might have to follow the additional steps here: https://www.youtube.com/watch?v=JADsIv2RUSw