Make sure all appliances are properly grounded. This is most important if there was damage to the wiring from the flood or during the cleaning. Mud or dirt in a grounded outlet or adapter may prevent the grounding system from working, and you could be electrocuted. If you are unsure of whether your electrical system is properly grounded, call an electrician. When in doubt, call an electrician.
Electrocution is a major killer in floods.
Meanwhile, if you are comfortable working with electrical fixtures and wiring, you can clean the flooded circuits. Otherwise call an electrician. Take out the fuses or switch off the breakers to the circuits you will be working on. The switches and outlets should be out of the wall. Check the switches and outlets and their boxes for mud and dirt which can cause a short or overheating.