If your local water has a high copper content, it can leave blue-green stains on the shower and/or bath areas. Another cause of this staining may be that your water has a low pH and is eroding your copper plumbing. If you have copper plumbing and you notice blue-green stains you should look into more permanent solutions to solving the copper corrosion problem, or else you may end up with multiple, pin-hole sized leaks throughout your plumbing. In the meantime, here is what to do to remove these marks.
Make up a paste. Use equal quantities of cream of tartar and baking soda (bicarbonate of soda). Add a little water to mix into a smooth paste.
Spread the paste across the blue-green stain. Rub in well.
Leave the paste to work on the stain. About half an hour should be sufficient time for it to do its cleaning job.
Rinse off the paste. Check the stain to see how much has been removed. Repeat if needed.
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