Does anyone know what will remove
>>finger print dusting powder<< used by the Police etc?
I've come across it before, and again today.
Nightmare to get it off, esp. WFP.
I tried Viakal, but made no difference, the only thing that worked a bit was good old scraper, but to do the whole window would've taken ages.
Does anyone know of any chemical/method that would remove it satisfactorily?
Cheerz guys and gals...