Viakal stained bathroom tile grouting blue. How do I get rid of the blue?

[Pippagled]

As the title suggests, using Viakal to clean my bathroom has turned the grouting between my bathroom tiles blue. What can I do to remove the blue? Any recommended products or formulas?

Sodium PERCARBONATE (not bicarbonate) is the magic ingredient for most stains. not sure in this particular situation but it is where I would start.

It sounds like the Viakal has reacted with the grout or left a residue. I'd start by scrubbing the grout with warm water and a baking soda paste using a soft brush, then rinse well. If the blue staining doesn't lift, the grout may have been permanently discoloured and might need a grout whitener or regrouting.

I've seen this happen when cleaning products sit on grout for too long. Try giving it a good rinse first, then clean the grout with a baking soda paste or an oxygen-based grout cleaner. If the blue colour is still there after that, it's likely stained rather than dirty, so a grout pen or fresh grout may be the best fix.