had this problem of otters and their favourite poop spots when docked in victoria harbour.....a number of us on dock go together & first pressure washed dock & areas under neath dock as best as could....then on dry days soaked top of dock with javex let dry then next few days repeated 4 times then put moth balls..on lower part of dock...a couple repeat applications over 2 months the otters found another area they preferred...it seemed the javex might have bothered feet..& smell of mothballs not very appealing....only caution dont let bare feet or skin touch dock...wears away after a week or so ...another group of sailors used CLR BUT QUITE TOXIC...good luck...............
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