Bosch · Dishwashers Series 6
Too much foam is generated inside the dishwasher during operation, which can be caused by using hand washing-up liquid or an unsuitable detergent.
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If hand washing-up liquid was accidentally added, immediately add rinse aid to the dispenser (Page 28).
If rinse aid was spilled, remove it with a cloth.
Change the brand of detergent or appliance care product if it consistently causes excessive foaming.