It's ok but not amazing

first of all I have a cream coloured carpet and I have a dyson vacuum (I used the brush head which helped to hoover it up a little better than the normal attachment)
I followed instructions step by step and of course it's never as easy as it says in the advert but I feel like I've done a lot of back breaking scrubbing for a half clean carpet. It has worked a little but the carpet still has a slight \"dingy\" look to it.
I feel like an old woman my body is aching from scrubbing out white powder stains and although I have aired out the room, my lungs are full of the stuff from being on my hands and knees. I'd recommend to a friend if they wanted to make their carpet look a bit better but I'd let them know about all the hard work and it not working 100%
I paid £4.50 and that was on special offer, I don't think that this is value for money at all I'd rather save all my money up to rent one of those vacuums with the water that deep cleans your carpet! over all it looks a lot better than it did, although I went over the area near the door twice and it still looks dingy!