Heat 1/2 C White Vinegar in microwave for 90 sec. Pour into spray bottle. Add 1/2 C BLUE Dawn Dish Soap. Shake gently to mix. Spray on surface and let sit 1-2 hours. Just wipe it away and then rinse with water.
Diy iron cleaning/ did this last weekend. IT WORKS! (I just used the b soda and vinegar) found on another site the same mix to clean the inside of the oven door. Nice, no spray to breathe in and it is so painless. no scrubbing!