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I wonder if anyone can advise us on this problem? We have a tiled floor in the bathroom, and in the last 2 or 3 weeks, the grouting between these tiles has developed orangey, almost rust-coloured stains, especially close to the shower, but it seems to be spreading along the grouting.

It doesn't seem like mould, and I've just read on another site that this colour stain can be discolouration from acidic soaps and shampoos. I've tried using bleach and scrubbing, but although lots of 'orangey' stuff seems to come off when I do this, the stains are still there when the floor dries.

Does anyone know what these stains are, what I should do to remove them, and how to stop them coming back? I'm most concerned that it may be some kind of mould, and that we're going to need to get the floor retiled and grouted...

Many thanks for any help you can offer!

I have the same problem with orangey grout.

After investigation it appears that non waterproof adhesive and non waterproof grout may be the cause. Furthermore if the floor and walls are made of Plaster, plasterboard, timber and timber-based products such as mdf or plywood which are absorbent they should be made waterproof by the use of a waterproofing system (or tanking system).

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I hope this is of help?