[Neil]

If you have large flat surfaces like paths to do the patio cleaner with the spinning arm are really good. Mine is a Karcher and it makes easy work of cleaning paths and concrete. The jet is contained in the unit so you don't get as wet yourself. You can use them on walls as well without all the spray bouncing back at you.

Someone above said they are rubbish, must be a naff one or using it wrong because the couple I've used are great.