Say No to the Ice
There are 38,695 McDonalds restaurants globally (possibly even more by the time you read this) so it goes without saying they’re doing something right. Their kitchens tend to be very clean but that isn’t necessarily the case for every one.
The ice cream machines are rarely cleaned, according to a whistleblowing employee. The ice machines aren’t recommended either. Apparently they don’t get cleaned much, if ever, and have mold inside. Seeing as the sodas are cold anyway, making ice redundant, just go ice-free. That also means you get more soda in your cup.