Complete the model's ordinary food-clearing and cleaning procedure before leaving, rather than leaving scraps in the chamber. Check for existing leaks while there is still time to arrange attention.
What the observation tells you
Isolation and storage advice varies, so use the exact manual when deciding how to leave the power supply. Keep the normal control off and make sure any person checking the property knows the appliance's status. Do not pour oil, disinfectant or an improvised preservative into the opening.
A useful next step
Keep the sink and surrounding cabinet clean and accessible. On return, inspect the area before use instead of assuming an unused appliance cannot have developed a leak.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.