Any links or name of the seller?
Rubbish, total waste of money, I also tried Lidl, Halfords, Autoglym. Finally bought some generic stuff on ebay brown box, white 5l container, no guarantee, no YouTube reviews, cheap as hell and guess what? It's WORKING.
The tesco own brand works just as good and is cheaper.
Little tip . Go to your local pound stretcher or home bargains and lift a bottle of elbow grease ,see through spray bottle with a bright yellow liquid .Try that for £1 , guarantee you'll be happy with the result .
Same price in tesco at momemt