dish soap or gentle household cleaner.
Apply it with a soft cloth or non-abrasive sponge.
This removes ordinary dirt and allows you to see whether the yellow mark is actually mineral buildup or something else.
Step 3: Try Diluted White Vinegar for Mineral Deposits
If the discoloration appears to be caused by hard-water deposits, diluted white vinegar can help dissolve mineral buildup.
Dampen a cloth with diluted vinegar and place it over the affected area for a short period.
Then gently wipe the surface and rinse thoroughly with clean water.
