Rotimatic recommends the use of Dispenser Cleaning Solution which was developed for the removal and prevention of impurities from the machine
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Buy the dispenser Cleaning solution on the rotimatic accessories page
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Or
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We recommend using citric acid as a close alternative. However, if you are unable to obtain citric acid, you can use baking soda/powder instead of citric acid but we have not performed any test using baking soda/powder.

Kindly make sure that the baking powder is completely dissolved to avoid pipe clogging due to undissolved powder.