Marc,
I think the issue is that most mouthwashes have alcohol in them. Some of their labels are confusing listing Active and Inactive ingredients separately…so read carefully. Act and Listerine, and others have some non-alcohol products. There are also some generic equivalents.
I have trouble swallowing, particularly at night and was recommended by a speech therapist to use a non-alcohol mouthwash, to use Biotene or equivalent for dry mouth (also a common Parkinson’s issue), and a 15 degree wedge pillow ( 7” at the apex of the wedge.) I hope this helps.
Mark