The incident happened last week at Kilohana United Methodist Church Preschool.
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According to KHNL, a classroom assistant who was preparing morning snacks for the children poured the cleaning fluid into the cups and then gave it to the kids.
The children took a few sips before workers realized the mistake.
The assistant apparently "saw the yellow/brown colored liquid container on a clean-up cart in the kitchen and returned to the classroom" with it, the Health Department said in its review.
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Reports said one 4-year-old girl and two 5-year-old girls were treated but had no signs of sickness.
Officials said the bottle of Pine-Sol was properly labeled.
Preschool staff will be undergoing mandatory training, and the school plans to rework its workflow with snack time.
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