Over time, a combination of:
- Soap residue
- Hard-water minerals such as calcium and magnesium
- Body oils and skincare products
can create a yellowish film that becomes more noticeable or begins to drip when wet.
5. Water Damage or Leaks
Don’t overlook this possibility. Yellow streaks could indicate:
- A slow leak behind the walls
- Water seeping through from above
- Failing sealant around tub or shower fixtures
- Condensation from poorly insulated pipes
Warning signs: If the yellow substance has a musty odor or the wall feels soft or spongy, you may have
