Just raise the price and don't look back. A year ago I raised my price on s/s. I was for 7 years 2$ for 4 minutes. My wash is among the highest prices in town, I don't really worry about the other guy. I just keep the place nice, just repainted, equipment always in working order and repairs made quickly. If there's an issue I take care of refunds etc quickly. I am now at 3$ for 4 minutes. My only regret, not having made the change sooner. I also have fewer people leaving a mess cause they go to the cheaper guy. I quite frankly am just fine making more money, even if I wash fewer cars and have less wear and tear on my facility. Good luck,