Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Company Policy; Procedure; Environment - Non Weather Related
I was the first to arrive at the airplane.  When I entered the cockpit; I immediately noticed the FO seat was positioned full aft with full recline rearward.  This is not uncommon in ZZZ when an aircraft has been at the gate for an extended period (apparently it is a good place to sleep; I've awakened someone more than once).  I reviewed the AML and noticed that the aircraft had been in storage for an extended period.  I conducted my power up and origination flow and noticed a gooey substance on the MCDU keypad and the Radio Management Panel. Due to my reclined seat position my initial thought was the gooey substance had come from someone's shoe as they were reclining in the cockpit.  This turned out to be incorrect.  Maintenance arrived; I exited the cockpit to make space; boarding had begun.  The Captain informed me that maintenance said the gooey substance was bird droppings. We started to discover bird droppings in numerous locations throughout the cockpit to include; glareshield; Flight Control Unit (FCU); side panels; sliding window control handle; headrest; storage compartments; and floor/carpet. Maintenance finished the cleanup; boarding was complete. We had to call maintenance back to the aircraft because we had another 2nd discrepancy; Uplink INIT REQUEST not working. I had to make space for maintenance again; it was then that I started to notice areas around the forward galley and entryway with bird droppings to include: FA jumpseat; panels near the main cabin entry door; and floor. The 2nd discrepancy was taking a significant amount of time so it was determined that passenger would be deplaned. I was talking with the flight attendants when we noticed significant bird droppings throughout the cabin to include: at least 5 passenger seats and seatbacks; headrests; and especially on several locations on cabin flooring/carpet.  It was eventually determined that we would swap aircraft.Company needs to develop a more detailed plan in how to bring aircraft back into service.  This obviously needs to include a comprehensive inspection of the aircraft.
Pilot reported finding bird droppings in the cockpit and throughout the aircraft after aircraft had come out of long-term storage.