I used the self clean programme on my oven a couple of days ago and towards the end of the cycle the inner glass panel broke! I rang up Bosch customer services and was told that if there is any grease on the glass prior to use it causes a hotspot which can cause the glass to break. I told them I always wiped the oven and door with a damp cloth as instructed in their manual so I didn't believe I was liable to pay for its repair. I also said that if Bosch knew there was a risk of the glass breaking why wasn't it mentioned in their manual. I was told it wasn't necessary as the manual says the door should be cleaned prior to use. As I have had the oven for approx five years I have been told I will have to pay for its repair as it is outside of their guarantee.