It's just not very cost-effective!
The salient point being that with a 1.5Tb hard drive costing about $65, the amount of space you can recover in most cases TRULY isn't worth the value of the time you invest in trying to clean up the drive. Eliminating an entire gigabyte (!) worth of unnecessary cached files saves you only between four and five cents... (!!) What is your time worth? Scrounging around and reclaiming 20Gb worth of disk space still saves you less than a dollar.
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