Hi Alan
I think you will find that some people go for Host, others Envirodri, and others whatever else is on the market.
Just like detergent and microsplitters really.
Why not buy a kg bag and try it. If you were nearer I would do a swop so I can try the Host!
Envirodri do some good spotters, pre sprays and other bits too - take a look at the website but do spell Envirodri correctly for the web address. Its an i at the end and not a y.
Generally - what do you do the edges of the carpet with - agitation I mean cause the Host nor Envirodri machine gets up to the edge do they?