I have a Goodman GMS 80 furnace on propane. The pressure port on the draft inducer constantly plugs with residue. I have to remove the draft inducer and remove the residue with a dental pick at least once a month during the heating season. Just using a tip cleaner to open the hole allows the furnace to run a day or two. Goodman has been no help nor has the supplier. Anyone have a fix for this? Thank you!