There was another article written a number of years ago here on FAOL that discussed scent. It was a very interesting article describing scents, negative and positive and how to neutralize scent on your hands and flies. One of the more interesting substances described in the article as a scent neutralizer was urine. So there you go. All you need to do to neutralize the negative scents on your flies is to........................well,you can take it from here.
"The reason you have a good vision is you're standing on the shoulders of giants." ~ Andy Batcho