Hi All,
I checked the amount of solution I was recovering versus the amount put in my tank when I started in September. About 85% was recovered from the carpets I cleaned, but this is probably on the low side as I was just getting a good technique going. This was the amount of extraction solution with me using ca 40L. I only put down about 3L of prespray so would think that most of the pre spray was extracted and / or very heavily diluted and it was mainly extraction solution left in the carpet.
I tend to think that there would be very little prespray left in the carpet after extaction and even if there was the percentage would be so low that even if still active whilst wet would not really be doing anything visual. The customer commenting that the carpets look even better the next day is probably due to the fact it is fully dry and has been gone over with a 'oovah.
Regards,
Adam.