'Fully clean' is a myth. The moment you're running cold email across multiple clients at any real volume, you're already in the grey zone. The difference between a setup that works and one that burns is just how organised your chaos is. I've seen people stack another tool every time a new problem pops up - that's random chaos, and it's a death spiral.
What actually shifted the needle for us was ruthless consolidation. Standardised inbox config, sending infra, onboarding flow, and reporting structure across every single client. One playbook, not a Frankenstein stack. You don't need more tools, you need fewer, tuned properly, and a process that doesn't fall apart when Google sneezes. Clean isn't the goal - predictable is.