This is a common sight around the world today, thousands of aircraft have been placed into storage since the start of the Covid pandemic. As it is impossible to clean these aircraft, paint degradation will be inevitable. Additionally, with cabins sealed and without ventilation, cabin interiors will be rife with mold on internal surfaces.
With the roll out of coronavirus vaccinations now underway, discussions have begun in many countries to plan a safe route out to allow everyone to begin flying again safely.