Window Cleaning in the Rain

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,
most clients will have no problem with you calling when the

weather is far

from Mark MUNRO

Window Cleaning in the Rain

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