Mallow leaf is known to have demulcent and anti-catarrhal (dissolves mucus) properties.
Demulcents coat mucus membranes to soothe and reduce local irritation
Infuse one heaped teaspoon with one cup of cold water, stand for 8-12 hours (best overnight) strain and warm slightly before drinking.
If not using the tea straight away, you can store it in a covered jug or container in the fridge for up to 24 hours and gently warm the mixture before drinking.