It's easier to launder money with services than goods anyway because you don't need to dispose of excess merchandise to make the books balance. Like if you want to claim to have sold 10000 cans of soda despite only selling 1000, you need to buy 10000 cans of soda or even the most superficial review of your accounts will reveal the scheme. The ideal laundering mechanism is a service with a high ratio of price to variable cost, like car washes or laundromats, because then it's easier to overstate income without needing to jump through hoops to overstate the matching costs.

These days, it's almost trivial to launder via wash trades with the proliferation of online services with effectively zero marginal costs. e.g., setting up a freelancer account and a separate business account on some platform like Upwork and then hiring yourself. So I'd be surprised to see anyone laundering via sale of goods unless they are deeply incompetent or it's an opportunistic scheme of some sort (i.e., they are exploiting a unique opportunity that pops up).