If you are really strapped for cash then vinegar or citric acid will work but be sure to mix with water. Download sunbeam em6910user manual and read descale section for vinegar mixing ratio. I personally would look for a cheap sachet of kettle descaler powder and follow directions ( just as good as expensive name brand pre-mixes like saeco and delonghi and much much cheaper). Most descaling substances are based around citric acid.
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