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Those files can be found inside the appropriate directory under C:\Users\user_name\AppData\Local\JetBrains\Transient\ path (there are also cache files for other JetBrains products).
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One of my interesting discoveries were Resharper cache files which can weigh even over few GB. There is also a colorful tree map that allows you to immediately spot large files. so you can easily drill down the tree looking for elements eating up your free space. This simple but extremely useful tool presents directory tree with attributes related to disk utilization such as: size, usage percentage, number of items (files and subdirectories), etc. When this is not enough I use WinDirStart to analyze my hard disk usage. When there is a need I’m starting clearing-up by emptying c:\Users\user_name\AppData\Local\Temp\ and c:\Users\user_name\Downloads\ directories (the second one against all appearances is often full of unnecessary files). My laptop stores everything on 250 GB SSD hard drive (actually Windows sees it as 223 GB), so from time to time I’m running out of free space.
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