Kitchen sponges harbor more bacteria than kitchen brushes, which may be a more hygienic way to clean your dishes, according to researchers in Norway.
"Salmonella and other bacteria grow and survive better in sponges than in brushes, the reason is that sponges in daily use never dry up," said Trond Mretr, a research scientist at Nofima, a Norwegian food research institute.
"The sponge is humid and accumulates food residues which are also food for bacteria, leading to rapid growth of bacteria." The research on the used sponges and brushes builds on a lab-based study published last year by the same team of researchers, which found that harmful bacteria survived better in sponges than in brushes.
The sponges were all used for washing dishes -- scrubbing pots and pans, and 19 of the 20 sponges from Portugal were used five to six times a week or more often. Of the brushes collected in Norway, 32 out of 35 were used five to six times a week or more. The sponges collected in Norway were used less frequently.
The owners of the sponges and brushes shared how long they typically used their sponge or brush and how they kept their cleaning utensils clean -- rinsing with water, washing with soap and water, placing them in the dishwasher or bleaching. While study authors recommended the bristles of a brush over the squish of a sponge, Cath Rees, a professor of microbiology at the University of Nottingham who wasn't involved in the research, she said would continue using a sponge to wash dishes. For her, the key takeaway was that drying dish sponges and cloths between use was a good idea.
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