Over spray from iron rich bore water is the usual cause of iron staining. It ranges from light yellow to deep brown to almost black and is more noticeable on cream or light colored surfaces such as concrete and urban stone.
IronKleen solid should be mixed with water the rate of 10% and applied with a brush.
Carefully rinse the treated area with clean water as soon as the stain is dissolved.
Over spray from iron rich bore water is the usual cause of iron staining. It ranges from light yellow to deep brown to almost black and is more noticeable on cream or light colored surfaces such as concrete and urban stone
 "Iron Kleen - Bore Treatment 10Kg")
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