Your pictures are not sufficiently high-resolution to be sure, but the top picture looks like copper stains that have been oxidized with high chlorine; the bottom picture looks like dirt.

Put a Vitamin C tab on the area in the top picture, and see if it affects the stain: if it does, it's probably a copper stain.

Brush the bottom area, and see if there is any effect. Dirt will move. Brown-orange stains are usually iron; brown-brown stains are usually organic.