We used Glossy Tears in a wash we recently installed and after testing the wash we got on the road....and yes it started raining. The results you can see for yourself.
Are you using the right chemicals for your wash. Yes you can buy a litre of washing up liquid for a cent or a euro and the same is true of car wash chemicals. You think the customer doesn't notice? Think again. If you have gone to the trouble of buying a new wash don't let it down by cheaping out on the chemicals. The customer does notice and is part of his decision making when he looks for his next wash.