Normally once a year I will take the garden hose and get the carpet really wet and get some dish soap and wash the carpet good then use a wet dry and suck it all out, high traffic spots do twice but it does seem to bring it back, this is on a fishing boat so toon might a take a bit longer.
My age is going to show here, but remember the old shag carpet back in the 70's.If you don't ask your Grandma.Take a leaf broom to it. Kind of rake in the opposite direction of your traffic patterns. The pressure washer and vacuum is the first way to get started then when carpet is most dry use the leaf broom
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