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EVERY YEAR AT THE END OF THE SEASON THE GULLS AND CORMERANTS GET TO PERCHING ON MY BOAT. THIS YEAR THEY REALLY MADE A MESS ON MY DODGER AND BIMINI.THIS STUFF IS LIKE CONCRETE WHEN IT DRYES. ANY IDEAS ON WHAT WILL CLEAN THIS OFF THE CANVAS WITHOUT DAMAGING IT? I TRIED WATER WITH A LITTLE BOAT SOAP TO NO AVAIL. HELP!