How should I wash butter muslin?
Accept that it will never look pristine white ever again.
Whatever you do, don't wash it in Persil. That stuff is designed to make your clothes bright &amp; nicely perfumed, not something you need in your turkey - &quot;seven day freshness&quot; isn't quite what they meant in the adverts. At least it doesn't have fabric conditioner in it, which would be even worse. No-one ever bought Comfort for how good it tastes;)
Unless you want to invest in some pure soap*  - flakes or liquid at various prices from reasonable eg Wilko's to truly ridiculous &quot;they saw you coming &amp; laughed&quot; then you'll be fine just washing it in regular washing-up liquid, or give it a soak in bleach first, so long as you rinse it afterwards until you can no longer smell it. [I'd just go with Fairy myself &amp; put up with the staining].
*&amp; run it through the washing machine all on its own, wasting an entire wash cycle for one cloth.