From time to time some bird - or perhaps several - takes up
residence in a tree overhanging a concrete walkway, patio,
or driveway. Very quickly a good bit of white bird-poop
accumulates. I haven't found a good way to remove this from
concrete. The hose gets the top 50% or so, and a stiff
broom then gets maybe another 20%, but the last 30% or so
just stays and stays.

Anyone here found a good way to remove the residue after
modest hosing and brushing?

Thanks.
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CWLee
Former slayer of dragons; practice now limited to sacred
cows. Believing we should hire for quality, not quotas, and
promote for performance, not preferences.