At a coworker gathering, if you want to avoid frequent interactions with the office cleaner, consider some of the following strategies and be as polite as possible: 1. **Choose an appropriate seat**: Try to choose a seat close to your team or colleagues you are more familiar with, so that you can naturally interact with them more. 2. **Participate in group activities**: If there are group activities or games at the gathering, actively participate in them. This gives you a reason to focus on the activity itself rather than interacting with individuals individually. 3. **Take the initiative to chat with other colleagues**: Consciously approach colleagues who may have common topics with you and start conversations, which can reduce the chances of contact with people you don’t want to interact too much with. 4. **Bring topics**: Prepare some topics or discussion points that you are interested in, which can naturally attract colleagues who share your interests to join the discussion. 5. **Keep moving**: During the gathering, you can move around appropriately and participate in different group conversations so that you don’t stay in one position for a long time to communicate with a few people. 6. **Exit politely**: If you encounter a direct interaction situation, you can simply express that you need to do some other activities or talk with other colleagues. This is both polite and effective in reducing long interactions. It is important to remain respectful and kind to others throughout the process and to come across as friendly even if you don't interact frequently.