Wash the jars in very hot, very soapy water or run them through the dishwasher several times.
Dry thoroughly then leave in a warm place, such as an airing cupboard, for about 24 hours. Terracotta is porous and you may not be able to remove all the marks completely, especially if the grease has gone deep into the clay.
For this reason, don’t keep the jars near the hob where hot fat can splash on to them.
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