Ask About Their Method and Chemistry
A company that plans to use a single generic acid mix or a wire brush regardless of your tile material is a red flag. Ask specifically how they adjust their approach for glass, ceramic, or natural stone tile — a company confident in their process will explain this clearly.
Ask About Sealant and Follow-Up
Descaling without a protective sealant pass leaves tile more vulnerable to fast re-buildup. Ask whether sealant is included and what results you should expect in terms of how long the cleaning typically lasts before touch-up is needed.
Ask for Local Experience
Arizona's specific water hardness and evaporation conditions differ from other regions, so a company with real local pool tile experience — not just general pressure washing — is better positioned to get consistent, damage-free results.