Hard to remove, hence its place as an indelible mark of guilt in movies.
Scrape off as much as you can with a blunt knife, then rub fabric against fabric with a little soap or washing-up liquid, and wash as usual.
If the stain persists, try a proprietary stain remover. Dab non-washable fabrics with methylated spirits.
Always check manufacturer's instructions first. Always try a test patch first. If you are unsure as to whether the item you are cleaning is suitable for our instructions, take professional cleaning advice first.
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