I have multiple allergies that various products cause rashes, but have found Koh to be safe to use, with pleasing results . I was very impressed with the grout cleaning brush and have recommended it to others. I would suggest that a better result is to apply the koh on whilst floor is dry and then wiped up before washing areas ie floor tiles with water and Koh afterwards. I am very pleased with the product .
Faithfully yours S Littleton.
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