[poky] best way to purge stale packages?

[Bob Cochran]

Hello,

Inside my work directory, I have three versions of openssl: 
openssl-1.0.0i-r15.2, openssl-1.0.0i-r0.1, and openssl-1.0.0h-r15.1, 
with the latter two being stale.  I also have artifacts from these stale 
packages in tmp/stamps.

I haven't come along a bitbake option or ancillary script to remove 
stale packages as my recipes bump.  Is there one?

Thanks,

Bob