If your client had spilled a glass of just plain water the same thing would have happened. It sounds like there is dry soiling down in all of those loops and under the backing, when liquid is spilled the dry soiling wicks to the surface as it dries. Very important to vacuum the heck out of looped berber to remove as much dry soil as you can, not much you can do for soil under the backing though. Wicking is a characteristic of this carpet. The good news is the spill is from an encapsulating cleaner so residue remaining is not an issue.
To fix simply use a low moisture technique (I would go with a bonnet) to re-clean the area affected and recommend to your client to vacuum after completely dry and explain the importance of a good vacuuming regimen with this carpet explaining to them how soiling gets trapped under the loops.
Richard Brooks
Hit The Spot
Exceeding Client Expectations
