Get-ChildItem -File | Where-Object LastWriteTime -lt (Get-Date).AddDays(-2) | Remove-Item

If you prefer shorter (and similarly obscure if you don't know the language):

    ls -file|? LastWriteTime -lt ((date)+'-2')|rm

I actually find PowerShell's version more readable, even if more verbose. But code is written only once and read a lot of times. I may not know what the +2 actually means with the -mtime argument. How would I change it to look for the age of two hours instead of days?