My favourite is to just get an old 3.5mm stereo male cord and cut off the end and carry the end around. Carry a few around with you when you think you might need one. When you see a public TV blaring whatever, just plug in the cord into the audio output of the TV and it will turn off the sound on most TVs
No remote or setting will ever change it until someone figures out what happened to the plug
My favourite is to just get an old 3.5mm stereo male cord and cut off the end and carry the end around. Carry a few around with you when you think you might need one. When you see a public TV blaring whatever, just plug in the cord into the audio output of the TV and it will turn off the sound on most TVs
No remote or setting will ever change it until someone figures out what happened to the plug
I love this for accessible tvs. Right amount of chaotic