Most people don't think about pH until they've already ruined their floor. Here's what you need to know about marble, travertine & terrazzo before you clean them. These stones aren't like tile. They're calcium-based — which means anything acidic eats away at them. Doesn't matter if it looks clean right after. The damage shows up over time, and by then it's not a cleaning job anymore, it's a restoration job. Three things worth knowing: 1. Stay neutral or alkaline. A pH of 7 or higher is safe territory. Anything below that is acidic and working against your floor, not for it. 2. Vinegar, lemon, and most "natural" cleaners are the enemy. They feel clean and smell good, but they're acidic — and on this stone, that means etching. Once it's etched, you can't wipe it away. It has to be restored. 3. If you don't know the pH of what you're using, don't use it. Check the label or ask somebody who knows the trade. Guessing with a $10,000 floor isn't worth it. I've spent 23 plus years restoring floors that got ruined by the wrong cleaner. Ask before you spray! TIP: Purchase some PH testing strips and test your concentrated cleaner before and after you mix for cleaning. For guidance post your question in here for discussion or call Mainstreet Cleaning & Restoration at 407-299-7971