You think a copper mesh with a few kV* would do the trick. From CNN:
Urine is eroding the world's tallest church tower
The tallest church in the world is under attack -- and the aggressor is human urine.
The magnificent 531-feet-tall (162-meter) steeple of Ulm Minster dominates the German city of Ulm, which lies on the River Danube in Baden-Württemberg.
But now officials responsible for its upkeep say the stone base of the Gothic tower, which has long acted as a lightning rod to late-night revelers looking to relieve themselves, is being eroded by salt and acids in the urine, Südwest Presse reports.
"Wildpinkler," as al fresco micturition is known in Germany, has become such a problem that earlier this year the city doubled fines to 100 euros ($109) for anyone caught in the act.
*kV - kiloVolts as in a few thousand volts. Restrict the current so there is no tissue damage, just a good healthy ZAP!. The finger of God as it were...
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