old fleece/duvet/blankets/polyester clothes (Highbury Barn N5)

I am looking or old & worn out fleece (clothes or pieces of cloth)/duvet/blankets (inc pet blankets)/polyester clothes to go under pond liner. Condition/colour/stains do not matter. Takes at least 20 years to start to biodegrade and I think 200 years to break down completely.
Collection flexible and reliable. Thanks in advance for any assistance.
Can you help with this request?
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