old /lib/modules still there after purging kernel

[Dan Jacobson <jidanni@dman.ddts.net>]

I long ago stopped using the older kernel, 2.2.  However in
/lib/modules/ I see 2.2.20/ 2.2.20-idepci/ 2.4.18-k7/ .
What is the recommended way of cleaning up the older ones?  Is the
user supposed to just rm -r? 
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