If you are tired of Layer Filters and miscellaneous registered application records polluting your drawings and eating up valuable storage space then you'll want to download this tool. I found out about this while reading Shaan Hurley's blog, so I'll direct you to his blog for additional information.
I downloaded and ran this tool on a folder that had 133mb worth of already slimmed down project related files. After running the tool the folder came in at a svelt 124mb. Check it out!