xcode 4.6 compiling takes up 100s of MBs, losing hard drive space

Hello fellow developers. I am having a hard time figuring out where my hard drive space is going. After running (compiling) the app to test, my hard drive space drops 150-300mb of space. I close the simulator and the space does not regain. I restart xcode and even restart the mac and the space is never recovered. I have lost over several GBs of hhd space now and unable to recover or even locate where the files are being created. I have used several disk management softwares to see what files take up how much space and so forth. I have cleared cache, cleared archives and such from xcode. I have tried removing and reinstalling. Any help would be appreciated. thanks community.