Kim and Aggie use the white Sarson's stuff. I saw the actual bottle on one of their shows.
It's what I've been using and it's fine.
Try a Chinese market for larger sized jugs of it.
I buy a 5L one for £3.99 in a Chinese market about a 10 min. walk from our home.
I use essential oils to get rid of the smell.
You can use the jug for all sorts of things afterwards, too - water plants, camping (GREAT water carrier), to wash the car, etc.