Purchased Neff B57CS24NOB electric oven with hide and slide door as part of a very expensive new kitchen.The glass in the oven door has full length streaks running down inside it.To get rid of them there are two and a half pages of instructions and three panes of glass to remove to clean it off.Thinking the door was faulty I wrote to Neff who ignored my letter.I then telephoned to be told I have to clean it.What is the point of having the self cleaning oven if the glass is all this hassle.Worried I will not get it back together again.