I can't be one hundred percent sure, but it seems to me that for a high-pressure washer you don't need a large number of workers at all. Don't you think so? When I hired guys from https://sparklewash.com/foxvalley/, then only 2 people arrived and did their job quickly and efficiently enough. That is why it seems to me that the human resource is not so much needed. It's another matter if we talk about technical resources. More investments are needed here, since these sinks cost a lot of money.