If you commute through Mortlake station and live or work around East Sheen, you will know how easily a small spill turns into a bigger headache.

If you live near Palewell Park in SW14, you already know that East Sheen homes pick up everyday wear in a very specific way: muddy shoes after a walk, fine dust from open windows, pet traffic, and the odd spill that seems to arrive five minutes before visitors do.