How else would you put it? That’s a really subtle way of asking something most people would be embarrassed to ask. Luckily in Texas they have no shame! And who can ignore it when they ask so nicely? People are ought to keep the pool clean simply because the sign is so thoughtful.
Despite all the stereotypes, Texans are extremely genuine, friendly people, and it’s only if you annoy them that you might get to see their bad side. It’s true they might have a short temper, but this is something anyone would get mad at, so can you really blame them?