Hi Dp
Yes we do the larger ones and yes they can be used for deep cleans. The smaller ones do struggle because they simply dont have the output to do anything other than move the grease about. The hand held units are good for small awkward areas that you cant reach with cloths and scourers but you can't use them for larger flat surfaces.
A lot of the larger machines go into production facilities but tends to be more on a maintainance task than a deep cleaning one. We've recently put the larger machines in to the likes of BMW, Cadbury's, BOC and British Pepper for this sort of thing. We've also supplied the Mclaren F1 team with steam cleaners but I'm still waiting for my tickets
Ian, they're definately not a substitute for dry cleaning curtains - dry steam cleaners aren't actually dry it's just that they use far less water than steam pressure washers! I have seen them used to remove water marks quite succesfully but generally speaking they're not for use on fabrics (maybe the one exception is mattreses. We do have a customer who has set up a business cleaning and 'de-bugging' hotel beds!)
This is the range we stock: http://www.express-cleaning-supplies.co.uk/shopbask/cg140001.htm
Regards
Mike