I hot water extracted a commercial glue down carpet, not knowing that the client had been sprinkling carpet fresh on the floor. When the carpet dried, there were white blotches everywhere. I thought techs didnt mix powered prespray well, so I told them to rinse carpet again with acid rinse. Next day spots were still there. I discovered later on that it was carpet fresh residue which isn't water soluble. I tried dry vacuuming, but it's not really looking all that good. What can I do to get carpet back to normal appearance????