Price as reviewed:
Fenwick’s FS-1 is a versatile cleaner.
Used at full strength it’s an effective degreaser, happily shifting thick grime off chains and sprockets.
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Diluted, as recommended, one part to 10 parts water, it’s not brilliant, still needing plenty of elbow grease with a stiff brush to break up road grime.
A higher concentration has the desired effect – we tried 1:5, which was much better.
You'll still be getting excellent value - only £2 per litre, it's biodegradable and smells nice too.