You could put a large amount of limestone down (it's calcium carbonate and will neutralize the acid until it's gone). If it's particulate, it might be dusty, though. You could also look into getting plastic pans--that would probably be a lot easier. There's a lot of inorganic carbonates out there, like baking soda for instance, that will do the same thing (baking soda is actually sodium bicarbonate, but whatever). Any of the carbonates will produce gas, namely CO2. You might be able to do some complicated stuff with buffered solutions or weak bases, but it's truly easier just to buy a plastic pan.