Going off the subject slightly.
Who tells customers to move furniture after removing the foil tabs? Even though the carpet is dry, sweat is still present under the tabs.
If you simply tell customers to remove tabs when carpet is dry and explain nothing else you will be heading for a lot of trouble. These tabs are water proof and water tight under pressure of furniture.
Always tell customers to MOVE the furniture slightly out of place when eventually removing tabs to allow the moisture trapped beneath the tabs to full evaporate before moving back into place.
I explain this to the customer and also get the customer to repeat what I have said to make sure it has sunk in.
The day you get wood stain in a carpet is the day you obtain some spare carpet for your house.
Regards
Peter