You have to treat it like a co-worker send you PRs for review. You review, ask to improve/cleanup stuff and it'll follow up. You can even ask it to remember so it follows the patterns in future. Even better, if you work with it to come up with a design first and then send it coding, you often don't need as much cleanup as the desired architecture is agreed upon early.

I would tell my co worker “this code has so many issues that I’m not actually reviewing it. Please make sure it meets the project standards before sending it back to me”if it happened twice I’d talk to their manager.