This is why responsible people would use biodegradable soap.

In hours, it is completely gone with no mess left behind, and no residue of any kind. Non toxic. Completely and totally harmeless.

Not saying I would do it, just saying I think about it.

Only a real jerk would go and dump something like laundry soap in to a fountain. That is really very harmful and damaging to the fountain, the people, the animals, and is generally a very bad thing to do.

Do no harm.