Sorry, it has never been an issue when I have made duck...
I never really thought about it before...
as a matter of fact, you are the only person I have ever heard that has had that problem...
I'm just suggesting possible solutions for you... (I have never used a bag for duck myself)...
as far as cleaning the oven, I do that regularly no matter what I cook... so it's not an issue for me...
all it is is hitting one button anyway... probably been 25-30 years since I last had a manual clean oven...

and as far as warning people...
I don't warn people to clean the frying pan after cooking fish or it will stink either!

Geeze, all I did was post a recipe that someone requested!
It's a recipes forum, not a housekeeping forum... <img src="http://www.traveltalkonline.com/forums/images/graemlins/Yikes.gif" alt="" />

[color:"blue"]Life with my wife... It's not just a marriage, It's an Adventure![/color]
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