[ThePadawan]

I'm still always surprised just how much rubber is allowed to accumulate.

Here's a snapshot of one of the Zurich runways: https://www.google.com/maps/@47.4792249,8.5411849,660m/data=...

Scroll a little NW or SE to see what the actual color of the runway is underneath all the rubber.

[waynesonfire]

i'm not surprised, look how invasive the cleaning techniques are.