As I said in title. If player dont join in game for a while, players ship will get cowered with chick poop. That can increase in time like 1 day, 1 week, 2 week and 1 month. After 6 months ship turns into really dirty and you cant even see the ship cause of bird poops. That can work like if player dont move his ship or play a mission.
EDIT: That wont effect gameplay. Just for decoration. Also you need to go a spaceship washer to clear your ship.