With all the singing I do I religiously clean my EV N/D967 & N/d767a Mic grills once or twice a month by boiling water & vinegar, removing the grill, wind screen insert & foam and soaking it in the mixture around
15 - 20 minutes. Then a good flushing with cold water and a tooth brush to get in between the grill. I also press the foam between 2 paper towels till dry....works great !