It's used for cleaning the bottom of fabric and dirty poster (6,4)

Guardian Cryptic #29223 | 11 Across | 2023-11-09
Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

TOILE(a translucent linen or cotton fabric) plus ( and ) TROLL(a dirty poster/an online poster with the intention of stirring trouble).

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