Thanks for the info guys.
The water in the van must be 35c so im not using very cold water
but I have to say when the water was on the glass it did seem
to react differently.
Also have to say that the problem area was north facing the glass was that
hot that I couldnt place my hand on it.
By the way its been 30c constantly for 4 months nowive never known it like
this in 23 years.
Yes Joburg is Johannesburg, crime capital of the world but with glass galore
domestic and commercial.
Thanks again
Colin