I wouldn't deface them, but I keep a couple mutetheads[0] stickers in my glovebox. Perhaps I can share the "secret mute" button with the next person.
[0] MuteTheAds.com
[0] MuteTheAds.com
This trick stopped working at all of the gas stations I frequent, sometime within the last year or so.
All at approximately the same time, multiple brands. Or at least multiple signages, not sure I could attest to big oil corporate structure consolidations!
I assume it was a software update from the pump/ad network vendor, possibly in reaction to the secret getting out.
So, thanks. :)