moss

Hi, I have a 57 plate Leon MK2 and recently noticed whilst being seated in the car the window seals (running along the base of the window) all have moss / algae on them. Running my nail over it removes the moss but is this a normal thing? If so what do people usually clean it off with? I have...

ive got an ibiza fr tdi, it was a SEAT UK car before me and i assume it had been left standing for a long time as it was 7 months old with 2k miles on, i think it must have been left under/by trees, as ive noticed that the seal on the front windows (bottom on both) are covered in moss, not the...