hi,
i reckon i t accumilates in this areaby getting behind the liner, which has
to be moved to. it probably goes in as a soup but dries there.
as it builds up eventually doesnt drain thru the sediment. or small
amounts will but major downpours either road spray or down off the
screen cant penetrate the soil plug, yes mind was solid by then so has
to move sideways into car.
you will also get a wooshing sensation from water in the main sill which
only drains to little holes in leading edge of rear arches, again prone
to blocking from muck deposited by wheel spray.
on mine it will show as a wrt patch on the side steps, or even on the road
if left to stand. enough for neighbours to think i had a coolant leak! apart
from fact didnt tast of antifreeze!
btw the carpet was well soaked and was leading to increased misting up
of windows. think sweety had same problem and had to cut out the
underlay insulation to dry, otherwise if severe the carpets will need to
come out. i used a vax on the carpet and then on the insulation and got
most of it out.