Why would you want to compress old files before deletion?
windows automaticly compresses unused files and its pretty non-standard to change the amount of days before it compresses them and its also easily forgoten so for that reason, speaking of which those are unneeded compressed files 99% of the time.
So it has nothing to do with some1 manually compresing files before removing them thats just absurd!
While on the topic of cleaning things that Windows Disk Cleanup does (Compress Old Files), I would also like to suggest that there be a seperate "Clear System Restore Cache" option.