Stripping XDATA

i have a number of drawings compiled from various sources and using various versions AutoCAD and 3rd party applications ... many have APPIDs and XDATA which
are not being used ...
using the FILTER command to search for XDATA shows that there are dozens and dozens of registerd APPIDs ...
not a problem for us ... but clients are reporting back that this is causing them problems ...
and they are acting weirdly when i try to clean them up ... AUDIT ... reports that there are a few XDATA APPIDs which are wrongly formatted and claims to have fixed them ... but hasn't since re-running AUDIT comes back with the same error the same number of times ...
does anybody have or know where i can get a bit of lisp to remove all XDATA and APPIDs that i could stick into a drop-down ... ???
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