Write a clear notice or sign people will actually follow

Write a notice or sign.

What people must do or not do: [rule]
Where it goes: [door / fridge / noticeboard]
Tone: [friendly / firm]
Audience: [residents / visitors / kids]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. A short primary sign.
2. A friendlier variant.
3. A firmer variant.
4. Extra sentences that weaken it — cut list.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, quotes or what the other person thinks. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.