Behold! It's the Karcher K5 pressure washer – and this jetwash system could well save your patio for this summer's promised sunshine. Especially if it's been looking as winter-weathered as mine.

The priciest washers on the market tend to be made by well-known machinery brands such as Karcher, Bosch, Nilfisk and Stihl. These are semi-professional models with high-powered motors (1,800W to ...