Curtain linings to block out sun 90” x 90” (Green Park RG2)

Hi everyone, sorry to bug you, but is anyone getting rid of some curtain linings please? The ones that block out sun (and in winter keeps heat in). That you attach to your curtains or hang with curtains, please, size 90” by 90”? It doesn’t matter if they are years old or stained. They will be going behind my curtains. I need to drastically reduce the heat I get in my flat. We have sun all day (yea it’s nice) but we get the heat trapped indoors. Having floor too ceiling windows (which wasn’t made too open), it’s like a green house in the living room. My plants love it, me, the boys and cat don’t ha ha. Many thanks for looking ☺️