In the US, the feds pay close attention to businesses like car washes, coffee stands, and taco trucks because these are often used for laundering.

There was a period where it seemed like they were doing some data crunching of IRS data and taking down domestic drug trafficking orgs (DTOs) this way, and a bunch of businesses were raided and shut down across the region I was in at the time.

Personally, I wouldn't do any of those and would launder through art and collectibles where the values are somewhat arbitrary. And "consulting".