That red cloth is a 'fukusa' — an essential item used to purify tea utensils in the tea ceremony.

Literal

That red cloth [topic-は] 'fukusa' tea-utensils [obj-を] purify [for-ために] use essential-item [copula-なの].

袱紗 (ふくさ) is the silk cloth used in tea ceremony (茶道) to wipe and handle utensils. 清める (きよめる) 'to purify / cleanse' — a ritual term. 必需品 'essential item / necessity' (必需 'essential need' + 品 'item'). The feminine sentence-final なの provides gentle explanation.