I use a ton of IAL in my tanks and there are some leaves that will get sort of a clear, slimy film on them when you first put them in the tank.
It is perfectly normal and could be what was causing the water in your container to go cloudy and smelly.
Otherwise my IAL really only has an earthy smell when I remove it from the tank. I do have leaf litter in a few of my tanks that is pretty thick and this can smell slightly foul if I remove it. However, I think that is because I allow it to break down over time rather than change it out every couple of weeks.