Talking [Q] Cleaning Android Build ?

Ok so I successfully downloaded and compiled Android from AOSP branch (I takes 4 days and 43 Error massagers and about a day of googleing to do all of this on my computer ) but my disk space is VERY limited and I realize each time I rebuild the source the folder was taking more and MORE disk space and I was wondering is there a way to clear a all the build file (Like in all IDE's you have the Clean function which will erase all the pre compiled files)
-(Can you see!!!! it The world of Open Source. Oh... look there is Android)