Anyone else see this? From what I have seen, it is like mold that is on signs that have been hanging inside in unheated buildings out of the sun for a few years. Cleans off easily with wax. One picture shows the mold. Other picture shows the top of the sign cleaned off.

Bleach will take it right off. Grows on all types of surfaces. Needs moisture and warmth to thrive.

Very common here...with all the rain we get. Especially on north facing surfaces. Like windows and siding on homes, parked cars and ect.

...yep...

Very common mold/mildew. Needs nearly nothing to grow.

Wes, the Salyut Space Station had mold growing on the walls in Space... The spores will attach themselves to anything and everything and start to grow....