Bosch PRS926B90E Mode D'emploi page 14

Maintenance
Always clean off any liquid as soon as it is spilt: you
will save yourself any unnecessary effort.
Grains of sand that may come from cleaning fruits
and vegetables will scratch the glass surface.
Melted sugar, or foods which contain a lot of sugar
which may have spilt, should be cleaned off the
hotplate immediately, using the glass scraper.
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