Finally gave the car a much needed wash today it hadn't been done in over 3 months. Would have liked to be more thorough but I'm short for time today might give it another go over next weekend.
Bit of advice for this which seems to have occurred mostly on the boot lid recess area. It's also around the rear number plate a bit. I got some off with Gtechniq W5 but seemed to be taking more effort that I'd like so was wondering if any of the more experienced could recommend something? It doesn't look like dirt almost like water staining so maybe something like water spot remover? W5 is good stuff so I'm surprised that even using neat couldn't take it off. Maybe I should let it dwell more and give it a few hits I guess it would come off eventually..
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