cayenne both dissolved and expells mucous. you can mix it into some honey or molasses and swallow without chewing to hide the heat from your tongue. its hte best single thing i can think of to combat systemic wide mucous. start out with small amounts and work your way up to the hottest pepper you can. start with maybe 60,000 HU rated pepper and work up to 180,000 HU or hotter.
a juice fast is also a great way of reducing mucous. add some ginger and some horseradish, and take the cayenne during the fast, that will really get that mucous up and moving our of your body.
how is your environment? is there mold in your house/apt?