A Sea Salt cleansing enema will often reduce or eliminate the coating on the tongue. Use 1 teaspoon of salt for each pint of filtered or warmed bottled water, or 4 teaspoons for a full bag. The water should be 103 degrees F (39.5 C) at preparation time.
You can take cleansing enemas as desired during your fast. I take one every day while fasting and look forward to it.