Up until recently, my ULT 18 subs have survived our band gigs with little wear. This last weekend we were playing and a dancer spilled his/her mix drink over our subs. The drink ran down the front of the grill of the ULT 18's and left visible streaks on the grill and inner foam. What is the best method, and cleaning solution, for cleaning the grill of my ULT 18's? I am worried that cleaning the grill could effect the foam on the inside of the grill.
PS: Yes, I have taken the grill off of the speakers.