How can I tell if a car wash’s vacuum bays actually bring in customers?

Start with the paperwork. Ask whether the vacuum income is metered or coin-counted separately from wash sales, and whether the seller can show it month by month. If it is lumped into one total, the claim that the bays “pay for themselves” cannot be tested. Then ask what the bays cost: electricity, motor repairs, hoses, cleaning and the coin or card equipment.

Next, watch the site yourself. Visit on a weekend afternoon and on a weekday morning, and note how many bays are in use, how long people stay and whether they drive onto the wash afterwards. A vacuum that draws customers who never buy a wash is a different asset from one that feeds the tunnel.

Finally, ask about downtime. Machines that sit broken for weeks tell you either that demand is thin or that maintenance is neglected. Ask for service invoices and read them against the takings for the same months. Your accountant can help you separate one-off repairs from a pattern. Ask too whether the bays are drawing visitors who would not otherwise stop. A regular who vacuums on the way past may never touch the wash, and that is fine if the bay itself covers its cost. If the seller promotes the bays as a draw, ask for proof such as sign-up numbers or sales on days the bays were closed.

Key takeaways

• Ask for vacuum income recorded apart from wash sales, month by month.
• Watch the bays at busy and quiet times, and see who goes on to wash.
• Read repair invoices against takings to spot neglected or underused machines.