Advice on cleaning black bathroom tiles that have white residue

[tom8080]

Hi Guys -- sorry, newbie questions -- lots of them, feel free to invite others...

Take a look at the attached photos.







What on earth is causing this white residue on my bathroom floor tiles? How do I clean it i.e. what methods, tools, cleaners should I consider (can I use a steam cleaner on it?) and my final question for the day, how can I prevent them from getting into this state again without being obsessive about the cleaning e.g. is there a protective spray I can apply to limit this problem?

 

[Lou]

Don't mind me while I bump up some older but good threads. If you can contribute to the thread, go ahead. But if it's nothing for you then don't reply and it'll soon drop off the What's New page etc.
Worth linking to our new forum structure while I'm doing stuff:-

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