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Watch Inside the Factory Season 4 Episode 1 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Gregg Wallace explores the Manchester factory that produces 700,000 toilet rolls a day. Cherry Healey gets the bum deal of following the flush through the sewers and water treatment works of Brighton, and historian Ruth Goodman finds out what was used to wipe with before the invention of toilet paper.