That damn stuff they put in fire extinguishers is a real pain to clean up, everything in the shop has a coating on it.
I second that. But better to clean up that mess than lose a barn or a machine.
My middle son is a fireman. So I do fire drills in my mind once a year or so. The idea is to burn in the alternatives so you don't get stuck doing something stupid instead of the right thing.
Where is the nearest extinguisher. How do you use it? Where is the fire blanket (a non messy way to put out a small fire). Where are all the water outlets and hoses. Make sure every corner of the shop has an exit path. How do you get out a window. Where are the emergency numbers. Who do you all call and in what order.
Same goes for chemical spills and accidents/injuries.
That last one is my biggest weakness cuz I usually work alone. Most farmers do. Farmer injuries dominate the emergency room traffic in farm country. 3 of my last 4 trips to ER were farm related incidents. The exception was my stroke. Lots of close calls too.
In my mind, the best time to think about an emergency plan is before something happens. Not during.