Persil liquid Colour liquid detergent has a new pack design and innovative formula that tackles tough stains, while keeping your colours vibrant. How to use Persil liquid Eco Pack. 5 extra washes compared to our 25 wash bottle (based on RRP)*. 78% less plastic compared to our 25 wash bottle. Can be used as a standalone pack or refill to 40 and 60 wash small and mighty bottles. Available in Bio, Non-Bio and Colour.