Smeg SE995XT-5 - Manual (Page 25)

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Instructions for the User
13.8 Cleaning the door glazing
The glass in the door should always be kept thoroughly clean. Use
absorbent kitchen roll; remove stubborn dirt with a damp sponge and
ordinary detergent.
Do not use abrasive or corrosive cleaners for cleaning the door glazing.
(e.g. powder products, oven-cleaner sprays, stain removers and metal
scouring pads).
Do not use rough or abrasive materials or sharp metal scrapers to clean
the oven's glass doors since they may scratch the surface and cause the
glass to shatter.