[Vicki]

Hi guys, wonder if anyone can help. cleaned a carpet 2-3 weeks ago where a puppy had left urine marks in around 20 spots. The client had blotted most of these at the time and also used a urine neutraliser on them. when we cleaned it was perfect, a week later still perfect, now at least 10 of the blackish marks have returned. this is on a nylon carpet and was hot water extracted with aggitation. is this normal to reappear and can it be stopped? :

[Andrew Briscoe]

I would lift the carpet, and check the underlay, and replace if damaged.
Repeat cleaning process and speed dry.

Andrew

[stuart_clark]

Vici  If the returning spots are black in colour, that would tell me they are possibly protein stains ! you should remove these completely with an enzyme digester ! chemspec make the best around its called enzall
but urine staining is generally permant, but wouldnt dry black or re appear block but more like a yellowish colour! hope this helps
Regards Stuart Clark

[lesterM]

How old is the house? The floorboards may been shellac stained.
Otherwise check for mould

[Vicki]

Thanks guys for your input, will give it a go.