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Hi geoff, i used to work for a pest control company years ago we used to spray it with a biocide first then scrape up as much as possible and double bag, then clean with stiff brush and biocide again. there was a lot of issues with the pigeon fouling entering the drainage system so we where made to do this before pressure washing. the biocide we used was px ornikill http://www.killgerm.com/product-group.php?group=50also on ebay. Regards Mark