Having operated a self-serve car wash myself, I've always been fascinated by the steady stream of income it can generate. The key to making substantial cash within a short period, like one week, lies in understanding the customer flow and optimizing machine usage. From my experience, coin-operated car washes can bring in consistent revenue, especially if located in high-traffic areas and maintained well. It's important to ensure all coin return slots function correctly—users are more likely to spend if they trust the machine won't swallow their money unexpectedly. Moreover, daily monitoring of deposits such as the $2 coin returns mentioned can reveal peak usage times and customer preferences. For instance, weekends and early evenings tend to see increased activity, which can inform staffing and maintenance schedules. Another tip is to keep the equipment clean and in excellent working order. Customers are more willing to pay when the service feels reliable and pleasant. Occasionally, offering small promotions or loyalty incentives can encourage repeat visits, further boosting weekly earnings. Overall, while it might seem surprising to make this much cash from a self-serve car wash in just one week, with proper management and strategic insights gleaned from monitoring coin deposits and customer behavior, it’s entirely feasible. This hands-on understanding has helped me see firsthand how consistent deposits and good maintenance can turn a simple coin-operated machine into a lucrative business.