Wipe your walls down after every shower or bath.
Yellow streaks on walls in bathroom.
The second explanation is that the yellow stuff is you eww or more specifically the oils from your skin lifted off by with hot water and redeposited onto the walls after the humidity in the room dies down.
Step 1 fill a spray bottle with 3 percent hydrogen peroxide which is found in drugstores or convenience stores for a minimal price.
Get rid of nasty yellow stains in your plastic bathtub using hydrogen peroxide.
You re not imagining things.
When condensation from a hot shower or bath forms on the walls and begins streaking or dripping down the wall drip marks occur.
Cracking or bubbling paint or wallpaper could be a sign of mold growing underneath.
Even with well ventilated bathrooms streaks in water based paint is still very common.
If you can see yellow patches in your home it might be yellow mold.
Mineral deposits remain on the wall and build up over time without proper cleaning maintenance.
Those drip mark lines on your bathroom walls do exist.
These lines result after the water evaporates.
This will bring out the spots and streaks even more as well as soften it all up for easier removal.
Typically these streaks have a slight yellowish tint which is released from the paint ingredients.
The streaks are not all that bad but it is annoying for me who loves keeping my walls fresh and clean.
Depending on the species the appearance can vary from bright yellow to muted from powdery to slimy.