Update, Gtechniq say its hardwater that has caused it !!!!!! All in one wash
I cant believe its possible?

i no we have soft water down in cornwall reading of 49 ppm your water cant be that hard in bucks . i always use filter water or pure water on last wash rinse stops the staining and spots on the glass and body . perhaps invest in a tank . daqua suppliers of di resin containers scotland worth a look t.t. new vehicle purchase
2007 supercharged 4.2 java black .sand leather vogue se trim
previous cars .
range rover classic 200 tdi
discovery 1 200 tdi
freelander 2 2008 hse
discovery 1 300 tdi
p38 4.0 ltr man r380 ex royal support vehicle on v5c
discovery td5 man off roader

I going to try and drip neat water on it and leave it and see what happens I think

I going to try and drip neat water on it and leave it and see what happens I think

t.t it is not the water its the cems in the gwash new vehicle purchase
2007 supercharged 4.2 java black .sand leather vogue se trim
previous cars .
range rover classic 200 tdi
discovery 1 200 tdi
freelander 2 2008 hse
discovery 1 300 tdi
p38 4.0 ltr man r380 ex royal support vehicle on v5c
discovery td5 man off roader

Yeah I see that but Gtechniq says it's definitely not the gwash