To clean either use a 50/50 mix of household bleach and water, apply with an old toothbrush, leave for 20 mins or so then rinse ...
or use this stuff (Top of the list )
http://www.toolstation.com/shop/Adhesiv ... 180/sd3107As for sealer..

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Verwood HandymanI Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....