When delivered car had been valeted but every time there is light rain or dew on the car the outline of all the writing reappears. I think this is because the water tends to bead slightly everywhere else (wax?) but not where the marker pen was. I have tried petrol, vinegar, and good old soap and water to remove it but to no avail.
I can't beleive I am the only person to have encountered this so what is the solution? Thanks for any help.