[pure tech]

Has anyone encountered this type of double glazing?
It is fitted to the inside of older existing windows/frames to provide more insulation.
One of my customers has recently installed this stuff throughout his home and the cleaning instructions state not to use even a squeegee when cleaning.
It is advised to use the suppliers cleaning products and very soft cloths.
With the customers consent I gently test cleaned a small corner in a spare bedroom using my usual method  (ettore porcupine and squeegee) and noticed in certain lights that the surface had multiple light scratches which would have been caused by the porcupine.
This stuff really scares me as I am now aware of the costly damage a windowcleaner could cause using his usual cleaning method.

[CLEANCARE WC]

I used to do a big pub with it everywhere squeegee'd that and it was fine.

I also do a holiday home with it too, again no problems. but in both cases i wouldnt say the secondary glazing was new so perhaps the stuff you have cleaned is different?

[rosskesava]

I won't touch the stuff anymore.

Too much hassle and too much potential for problems.

[pure tech]

The trouble is that unless you are alert and look closely you may just start cleaning and damage the lot.

[CLEANCARE WC]

The trouble is that unless you are alert and look closely you may just start cleaning and damage the lot.

pr0bably why i havent got the pub anymore 

(its not really  )

[pure tech]

Another likely problem is water leaking into the cavity (especially if wfp is used) as the outer glass and seals generally remain as they were.