I had red chalk stain in a kohler bathtub and tried everything to remove it.
Then I read that the red chalk is made from rust properties or something like
so I used Ospho on the stain. It disappeared in seconds!!! I don't think you
I just found out today how to remove red chalk. Never been treated concrete 4
months old. Framers used red chalk and we are going to seal for the finish
floor. The answer C L R. Calcium lime rust remover. I used full strength with a
disposable paint brush. Brushed it it for about 30 sec and it was gone! Rinsed
with a wet rag and moved on.
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