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I would do one of each. My thought is that the customer sees brushes on the combo and it’s a brush wash only. Convincing some of them otherwise would be an uphill battle. I would think a dedicated touchless machine would do a better job than a friction machine with some hp nozzles stuck on it. My $.02
Most combo units I've seen are a compromise on the touch free side (the Coleman fusion X is probably an exception to that), The best touch free washes need to profile and get good impingement on every surface. Plus the dual purpose machines are much more complex than a single purpose machine. For those reasons, in addition to customer confusion about what is offered I vote one of each.