Upstairs neighbor dumped pet food and a tray on my balcony (twice) — Onni refuses to clean it. What are my options?

Location: Seattle, WA

I’m beyond furious.

I live in a Seattle apartment managed by Onni Group, and for the second time, the upstairs neighbor has dumped pet food all over my balcony. This time, it included a metal tray or container — which easily could’ve hit and injured someone if I were outside.

The first time, I cleaned it myself. Gross, but fine. This time, I refused. I reported it to Onni management immediately with photos, cited Washington tenant law (RCW 59.18.060), and asked them to clean it up or have the resident responsible do it.

Their response?
“It’s a civil dispute between tenants.”
They said they can’t require the other resident to clean it and that I’m on my own. That’s insane.

I am considering filing a complaint with Seattle SDCI and mentioned I’ll take legal action or small claims, but they still haven’t done anything.

What else can I do here?
• Can I force them to pay for professional cleaning?
• Can I stop paying rent until this is resolved?
• Has anyone successfully escalated something like this?

Also, if you’re considering renting at an Onni property — DON’T. The building may look nice, but the management is useless when it actually matters.

Any advice is appreciated.