I have some maintenance throughout the season, end of season, and start of season.
At the end of each season I thoroughly clean each call with a 50/50 mix of mouthwash and water, soak a bit, rinse and store in old buttercup in the fridge till next season.
Start of season, I basically so this again and start talking turkey
During the season everyday when I'm done hunting I take my calls and clean them with my tooth brush and tooth paste and rinse. Keeps them good and clean, no sour taste and even leaves a mint taste to them.
MK M GOBL