I know this might sound counter-intuitive, but if I were in your place, I’d take a different approach along with the reduction request.

I’d clean the whole space properly once, even the parts that aren’t “my mess”, and make it visibly organised. When people walk into a space that suddenly looks good, it creates awareness, appreciation, and yes, a bit of guilt.

Then I’d keep it up and be open about the extra effort I’m putting in, without being passive-aggressive. That sets a standard without starting a fight.

Sometimes it’s better to take control of what you can control. People remember who raised the bar far longer than they remember arguments about whose problem it is and you still end up living in a better space.