Thanks for the replies guys.
Mike,
It was the customer who actually stated she wanted some sort of anti-microbial treatment - she's just worried about her daughter eating the carpet! However, I checked out both Clensan and Microsan (cheers, Martin) on the Prochem website but will probably go with Clensan because it can be diluted directly with the Crystal Green solution. Two birds, one stone and all that!
Dave,
I couldn't find any reference to Ultrafresh on the website so you may well be right about it being discontinued. Reminds me that I'll have to check Cleansan will definitely be family safe.
Matt,
I nearly googled CCSW... nearly but not quite!
Thanks, again, for the help.
Darren.