Colin Wilson wrote:
Prochem Urine Neutraliser
http://www.prochem.co.uk/deodorisers...sanitizers.htm

That sounds like the one I was thinking of - thanks :-)

Look up Janitorial Supplies in YP, most stock it. Around £6 for a
litre, with which you could deodorise several houses.

YP ?

Crickey, tell them Biggles.