So every time I run disk clean-up it says there's a ridiculous amount of temporary files that can be deleted (See attachment) and when I hit OK it says they've been removed, but I check my hard drive space and it's only increased by maybe 100gb, if I re-run it again afterwards then it says there are near to no temporary files available. This has been a problem for more than 6 months now, and my hard drive is slowly filling up more and more and I can't remove or find the files that are taking up all the space!

I have a one terrabyte hard drive and not enough files to fill the current 800gb that is used, so how can I delete these come-and-go temporary files once and for good or at least locate the abundance of files.