Can I de-scent flys?

I have a lot of good (expensive) flys but I seem to get a lot more
suspicious looks and then refusals than I should. I know the size and
patterns are good but wonder now because of the incredible sense of
smell trout reputedly have that the flys have somehow become tainted.
I'm not a smoker,careful with sunscreen,insect spray and wash my hands
etc but is there a way or product I can wash the flys in or with?
Regards Simon .