Well they can either be mold or iron in the water that is discoloring your grout.
Orange stains bathroom walls.
First of all what are those orange stains in your grout anyways.
Here s the best solution to clean orange water stains without harsh chemicals.
Depending on what it is there are a few different approaches but i found my simple approach is the easiest and yielded good results.
The use of cleansers that contain bleach only worsens this problem as the bleach.
In my case i believe it to be iron in the water since we have tried cleaning this tile to no avail for quite some time.
The orange stuff on the wall of a bathroom shower usually starts as light pink and can be found in other areas of the shower and shower curtain.
This will bring out the spots and streaks even more as well as soften it all up for easier removal.
Orange stains are caused by hard water which is usually found in cities.
The first cause is mold which develops from the combination of moisture and warmth in the bathroom.
If you re not sure whether you have hard water speak to a plumber about testing your water because hard water can do damage to your hair.
It makes it even easier if you turn your shower on close the door and let the steam from the hot water build up the humidity in the bathroom with the fan off.
Orange discoloration on the tile grout in a bathroom has a couple of main causes.
Consider testing your water if you have orange stains in the bathroom.
The orange stuff can also be found around the sink and in both the toilet bowl and tank.
The iron oxidizes and collects on the surface of bathtubs and sinks to create an unsightly orange red stain.
Iron can stain the bathtub and other light colored fixtures that the water touches.
How to clean orange stains in shower.
What are those orange stains in my new white grout.