Blue stains in shower, tub or sink fixtures, are in the vast majority of cases, a result of household water that has a low pH. pH is a measure of how much acidity water has. Blue-green stains, like the one shown up to are normally the signs of minerals the water from dripping faucets. Use a vitreous enamel cleaner like this to clean enameled tubs and avoid using scouring powders, that may scratch the surface. Blue or green staining occurs exclusively with copper pipe and fittings (including brass, which is copper + zinc), and is caused by the corrosion and dissolution of the metal itself. When the copper-laden water is allowed to sit, it stains. Rust stains on your faucets and plumbing fixtures are caused by high iron content Blue or green stains on showers, sinks, and other plumbing fixtures; Green Three years ago a stain appeared in my shower. It’s a blue-green stain coming from the shower handle to the drain, a streak. Does anyone How to solve blue staining of your bath and plumbing fixtures. 6.5-9.5 pH. The picture on the left actually shows a bathtub from a home with pH levels of 6.7. I’ve been scrubbing this blue stain in a bathtub but it’s not going away. It’s in a tub that wasn’t used for a couple of years. Anyone know what 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. Remove Sticky Residue from Non Slip Items in Bathtub Green or greenish-blue stains on your tubs, sinks, toilets and plumbing fixtures are not only unsightly, but they also indicate a problem that hello any ideas on the best way to remove blue marks on bath. i am not sure whether this is from the taps? it is a newish bath which has not been us.