I can offer some general insights.
If you notice a sticky clear substance inside your refrigerator, it is unlikely to be a refrigerant or freon leak. Refrigerants, including freon, are typically colorless gases or liquids when they are in their proper state within the refrigeration system. If a refrigerant leak occurs, you might detect an unpleasant odor or see an oily residue, but it is not typically sticky or clear.
The most common causes of sticky substances in a refrigerator are spilled food or drinks that have not been cleaned properly. Over time, food particles and liquids can drip or spill within the fridge, and if they are not cleaned promptly, they may dry out, leaving behind a sticky residue.
To address this issue, thoroughly clean the interior of your refrigerator. Remove all items, including shelves and drawers, and wash them with warm, soapy water. Use a mixture of water and baking soda to clean the interior surfaces of the fridge, including the walls and door seals. Be sure to dry everything thoroughly before placing the items back in the refrigerator.
If you clean the fridge and the sticky substance persists or you suspect a refrigerant leak for other reasons, it's essential to contact a qualified appliance repair professional to diagnose and fix the issue. Refrigerant leaks can be hazardous, and they require specialized knowledge and equipment to repair safely.