I have been a happy user of Karcher steam cleaners for over 7 years now, and can hopefully help a couple of the reviewers with points they have raised:
- The 'spinning cap' issue. The safety valve is designed so that it will not release until the pressure in the tank has dispersed. It is not a fault, there is no point getting your bodybuilder friends to try to force it. It is a deliberate design feature. I admit that it is very frustrating to have to wait for the tank to cool before you can top it up when you are half way through a job, but surely that's better than getting scalded by steam?
- Limescale. Try putting some vinegar or lemon juice on the limescale and letting it sit for a while before you attack it with steam. I successfully removed large amounts of built-up limescale from around the taps when I moved into a new house.
- Of course you still have to wipe - or in the case of built up, burned on or very old stains - go over them a few times. The steam will loosen/dislodge/melt dirt, but will not make it 'vapourise', if you'll pardon the pun. Steam makes cleaning easier, it does not make it completely effortless. I do think, though, that it gives a better result than chemical cleaning, and without harming the environment or leaving harsh smells behind.
- As for the reviewer who complained that the steam is very hot, well d'oh!