Still indecisive between "reactive" and "preventive" measures on your invested kiosk?  There's a reason on the slowly but surely trend towards zero contact service delivery in public and in-store settings.

Check below for compiled reports on public touch display hygiene issues.  (original links at the end of the page)

Insurance Quotes link:  https://www.insurancequotes.com/health/germs-at-the-airport

Metro News link:   https://metro.co.uk/2018/11/28/poo-found-on-every-mcdonalds-touchscreen-tested-8178486/

Trend Monitor link:   https://www.digitalsignagetoday.com/articles/touchscreen-sanitation-is-a-top-concern-for-customers/