Normally this kind of steam cleaner are quite expensive like the Karcher SC1122 but I am not very sure how good this one is but with the ALDI return policy I think worth a try.
http://www.youtube.com/watch?v=nC0PnFs1qp4&feature=share
Of course I know we cannot compare a Karcher with a Lumina.
Please share if you have experience with it.
I got one a previous time. Was useless on some stains on a rug I had. Haven't been bothered to try and use it on any hard surfaces yet though. In fact I had forgotten I owned it. I might dig it out to have a go at some mould in some tight corners in the shower.