The stain is from what?

The contractors use tiles cleaner to clean. It is actually diluted HCl (hydrochloride acid) which can easily be bought in hardware store. I think mostly because to clean cement used in grouting and also used to remove stain from welding (dissolved iron stain).

What kind of tiles? My floor tile even applied 3 times also still okay. The only precaution is you need the place well ventilated to avoid suffocation. It will make stainless steel turns black though but it can be polished to shine easily.

Maybe can try polish.

Did you look at the fridge placement requirement like how much space need to be at rear, right and left. Modern fridge has heater to sidewall and also in water tank at the back to evaporate water. Did you switch off the fridge for long leave? Maybe water overflow from container at the back? Probably just water stain but hard to remove?

Wooooo ... leaking piping in kitchen. Find from where it is originate. If from behind fridge, then need to move it out to trace

Bathroom/Toilet behind the fridge wall?

This post has been edited by Zot: May 16 2022, 09:53 AM

I think better get contractor solve the other issue first and probably they can do the cleaning too. No point to try to clean if the root cause is not solved yet.