Smeg SC361X Instructions For Installation And Use Manual page 24

Use absorbent kitchen roll; remove stubborn dirt with a damp sponge and
ordinary detergent.
Warning: before removing the panes of glass, make sure that the door
has been locked in open position as described in points "7.4 Removing
the door". This operation might have to be repeated during the removal
process if the door is accidentally freed.
To replace the panes of glass in the oven door, follow the instructions
provided in reverse order.
WARNING. Never use the oven without the glass fitted: the outside
surface of the door overheads
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Instructions for the user