Eureka, I think that may work assuming the metal is on the outside glass. I'll try it out on a small section tomorrow and report with the findings.I had a customer with the same problem on an older 5 series BMW, I used to run a detail shop. I just took some steel wool, and a product called...colonel brassy, simple metal polish, gave the desired patch of windshield a very rigorous scrubbing and that seemed to work for him.
After using Brasso, couldn't find Colonel Brassy at the local hardware store and scrubbing with fine steel wool, I got NADA! Then I went for a second round allowing the Brasso to 'soak in' for 10 min and then scrub again and once again NADA.I just did it to both the interior and exterior of the glass. I didnt know which was the one that needed to be stripped but... also be sure you dilute it with glass cleaner, the colonel brassy itself will scratch the glass, and the best thing to use is a small wax applicator pad. the steel wool would be my last ditch effort.
my only other thought... make sure youre insurance covers glass and park windshield first at the local driving range...Then I checked the service manual that I bought for the car and I found a line that said: " The heating element is contained within the windshield."
Well that kinda sucks.... Oh well, it was worth a shot.
The only reason I was able to figure it out was because I have a V1 with the arrows and it was always my rear arrow going off. The front was NEVER going on. At first I thought the detector was fubar, and thought I should send it in. Then I saw a posting on the radar detector forum that some newer BMWs have the same issue except that the BMW engineers where smart enought to leave a hole in the heating element specifically for detector usage. So then I went to a local plaza with a CVS and did some testing. Behind the windshield rear arrow, stick the radar detector out the driver's side window and then the front goes crazy.....LMFAO! That does suck. My '96 STS's RD goes off about when I see the cop. Maybe this is why it reacts slowly. Damn.