We strongly advise against the use of any sharp objects, such as knives, to remove frost from the interior surfaces of the unit. The condensation tubes within the unit are situated very close to the plastic walls. Using sharp objects could inadvertently damage these components, leading to holes in both the plastic wall and the condensation tubes. Such damage can cause leaks, impairing the unit’s functionality and potentially leading to operational failure. Please note, damages incurred from this type of action are not covered under warranty. For safe and effective maintenance, refer to the recommended procedure for managing frost accumulation as outlined above.