My tiniest caveat is baking soda and vinegar is meant to create microscopic bubbles that can physically lift and agitate things – but you are correct it’s not a chemical/solution for cleaning - just a little micro scrubbing for particular use cases. .
I think that’s gotta be part of the point of this ruling. Ignoring who is being advertised, this billboard is no sexier than your average car/perfume/alcohol/underwear ad, so it shouldn’t be disproportionately limited.