Hi Frank,
I tried it and it worked a charm. I used Creme peroxide 12% 40 VOL that I bought from Sally Salon Services. I just poured some into a bowl and aded some oxy and gave it a stir before applying it to the A1200 case. I did mine over winter and the first application was done outside but due to the cold I brought it in. Now here is where my experience differs from the others...I did mine in the laundry room which has no windows and therefore no UV light! Despite this it worked brilliantly and the A1200 looks as good as new. My guess is you're not using the correct concentrate of peroxide.