Need instructions for this oven, it was 'inherited' (with no instructions). The Prima oven door has double glass, I need to know how to clean in between the two glass doors and also how to clean inside the top of the oven where the grill is, Oven fascia showing the centrigrade numbers for the oven heat have been almost obliterated with cleaning is there a rough guide as to where 0 -200oc is? Nothing showing in the manual for LPR9023 about any of these problems