The difference that solvents make to polishes is astounding, both acids and alkalis keep on working after you've finished polishing, that is why they go dull two or three weeks after polishing. That way the manufacturer sells more polish. They etch into the metals, some actually eat Zinc, a component in many alloys and steels. A polish should have a neutral pH. You'll find that all most every manufacturer out there will not know even the pH of their polishes. That's why they are no good. It's just a blend of abrasives and solvents thrown together to make a buck. Check out www.englishcustompolishing.com/usca/myths.html and find out a few truths.