CAN I HAVE MY WINDOWS CLEANED IN THE RAIN WITH WATER FED
POLES
If we examine the water cycle, we learn that the water evaporates
from the
surface of lakes, rivers and the sea. Their mineral content is left
behind when
the water vaporlses, which means that when the water condenses
and forms clouds, the water is pure.
It is this pure water that falls as rain. The rain does not stay pure
for long
however, because as it falls through the atmosphere, the water
molecules
bind to and dissolve all the minerals it comes into contact with on
its way to
the ground.
While this water is no longer pure, it does have a relatively low
mineral
content. In the UK with our usual south westerly winds, the total
dissolved
solids reading of this water is around 14 T08. with the limit for spot
free
drying being 9 TBS or lower. (Some tap supplies will reach 500+
TDS)
When cleaning windows with pure water, pure water is left to dry
naturally on
the glazing, when the rain comes into contact with this water, it
serves to
dilute the rain water. If an equal amount of rain water falls on the
freshly
washed glazing, the TDS reading of that water will then read 7 TBS
within the
range of spot free cleaning.
In short then, you can clean windows with pure water in all but the
most
torrential rain with most satisfactory results.
Many clients may well be sceptical at <rst, as using chemical
cleaners leave a
residue that becomes sticky and actually attracts dirt and that is
what they
will be used to. However once they have seen the results for
themselves,
