I would suggest that you cut the mouthwash solution in half and try it again.
The only coating that can be left is a small amount of chlorite and it doesn't last very long. You may be feeling "clean" and it may be a little strange if you have not experienced it before.
Also, after you brush rinse your mouth with water prior to using the mouthwash. Toothpaste can leave a coating on your teeth and this can react with the chlorite.