This isn't true anymore Richy. The reason alkalines got a bad ( and well deserved rap ) was that companies were using cheap butyls and caustics in their cleaners. Those types of butyls for the most part were outlawed about 5 years ago. AG CWC has a ph of over 13 and after using it on all types of wheels for the past three years, it has never given me issues. My APC has a ph in the high 12s, and yet I've let it dry on glass and used it on two different sets of polished aluminum wheels with no problem. Most cleaners including Optimum Power Clean and AG Powermax are in the 12s as are a lot of carwash soaps. The ph level isn't as much of a concern as the actual ingredients.