McKee's 37 Tire & Rubber Rejuvenator is designed to remove dirt, grime, old tire shine, and of course browning from all tires. It does so without causing any harm to the tire or the wheel, which I'll expand upon below....
Long time no talk! I'm glad you were able to meet me, my wife, Bob McKee, and Joe Metlow in person at the Classic Auto Show in LA. I hope you put that bottle of N-914 I gave you to good use.
Formulating a high-octane degreaser is easy...formulating something that is both strong AND safe, is not so easy. That's where Tire & Rubber Rejuvenator excels. It's the strongest the product can be formulated without posing any harm to the tire, your wheel, the environment, and so forth. I have 7 different lab samples of this formula still in my garage (I save all of them!), 4 of which are technically stronger than the production-spec formula. Those 4, however, are too strong to be safe for the tire. Testing like this goes into each and every product manufactured by McKee's 37. Having a clean car is one of the (many) perks of my job!
It's no secret that if you're cleaning a brand-new tire or a tire that has been "dressed" over and over again, that it's going to take a lot of cleaner to get the job done. There's a balance with tire cleaners: if you formulate the product too strong, it will cause the antiozonants and rubber conditioners to leach out of the tire over time. This is not good.
I'm not surprised it took a lot to clean your tires. As someone that hangs out on a car care discussion forum, I'm sure you regularly dress your tires with some type of gel or spray on tire shine. For this reason it's normal to have to use a little bit of elbow grease. Detailing does require some work you know.
The AGO veterans already know this, and I'm sorry to have to repeat it again, but the McKee's 37 customer care hotline is open 24/7/365. Outside of our normal office hours (7 am to 5 pm M-F), all calls are forwarded to my personal cell phone. I'm not much of a texter, though, so if you have a question, concern, or would like to share an observation, give me a call!