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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
“Add small amounts of water to the bicarbonate of soda and it will form a non-toxic paste that can then be applied to grout with the likes of a toothbrush.
Source: https://www.express.co.uk/life-style/property/1760128/how-to-clean-tile-grout
Other natural remedies include bicarbonate of soda, which absorbs odours and moisture.