In a microwave oven that is not cleaned well, there can be a layer of grease at the bottom. In contrast to water, this grease does not evaporate and will become very hot in the microwave oven where it touches the bag. This can leave scorch marks on the bag and can even lead to damage of the bag. Prevent the fabric from touching grease and recharge ZARPAX in a clean dish and optionally use double-folded kitchen paper beneath the pouch.