Mix a tablespoon of citric acid with a liter (4 ⅓ cups) of water, and stir until dissolved. Boil the mixture and then let it sit for 15 minutes.

Generally, she says citric acid has a pretty long shelf life. Check the expiration date — if you're not sure if your citric acid is good, she suggests tasting one or two granules.

Living Everyday cheapskate: How to use citric acid to clean, descale and restore just about anything Published: Apr. 26, 2022, 5:45 a.m.

Pastry chef Natasha Pickowicz explains how food-grade, GMO-free citric acid can improve all sorts of home cooking, from sprinkling it on popcorn to adding it to marinades and smoothies. You can ...

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