I have the same table and to get rust off chrome legs i used vinegar mix w water and crunched up piece of foil shinny side up. rub off the rust w water vinegar mix. Then try some finr steel wool then use windex to shine legs. First can scrape some of paint off any spots on legs w steel wool. my legs look new. i also use windex to clean and shine formica. janice

Think it is the manufacturer. I have brushed nickel in the kitchen, Delta with a Kohler drain. No spots. A Pfister, recommended by the plumber, is in the downstairs guest bath. Can't say I have spotting on the fixture. Guess we don't splash on it. BUT the drain cap on the pop-up drain became horrible fast. The minerals clung to the drain cap so bad we thought we would never remove it. Now we wipe any drop of water that gets on it. So a wash cloth sits on the counter just for that purpose.

https://www.grohe.us/en_us/bathroom/masters-of-technology-made-to-last-surfaces/

I think you’re overthinking it. I have brushed nickel in my very modern bathroom that has all chrome fixtures and it looks fine.