Rust on painted concrete

Hey guys hope everyone is doing great. I have a job coming up this week for a customer cleaning their patios and a big pool deck with deep rust stains scattered all over. I have actually had good results cleaning rust stains on concrete with Iron Out applied generously with pump a sprayer, stiff brush, dwell and surface cleaner. It’s cheap which is good for multiple applications. The pool deck and patios on this job are painted. Would during if you think the Iron Out or any product for that matter will eat away the paint? Also I’m going to skip the surface cleaner and just rinse. Appreciate all the great knowledge on here. Thanks!

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