This topic reminds me of the original "diet doctor pepper commercial"... There is no supported method to purge individual data out of the field titled 'rawevents' or 'raw events'. It is what it is (that's the last word from 'support' and the senior engineer). So what's the lesson learned, don't store raw events on a logger unless you REALLY NEED them because once they're in there, they ain't comin out until they age off the system.
'Good luck with that one bub' <laughter>