Best supermarket product to clean carpet, please?

[TwiggyStardust]

Just that, really!

Thank you.

Nearly all supermarkets sell All Purpose Cleaner. It will be in anything up to a litre. It's neat so you can dilute depending on the carpet. It's usually about £1 so great value. You could get five litres if you mix 1:5 with water

Thanks @Burnthurst187. 👍🏼