Hi Cheetahjade, I don't have MARCONS but I've used a nebulizer for asthma. I assume if it's in your sinuses then you have to use a mask, rather than the breathing tube. The medicine comes in little liquid tubes which you pour into a cup, which is then dissolved into mist that you breathe in through the mask.
Do you have a nebulizer/are you renting one?
I just googled Acetylcysteine and it's for reducing mucus.