The invention relates to an image recording device for a body of a motor vehicle. The device comprises a housing part, an optical element having an outer surface, and a driving part for engaging an engaging part of a movable cleaning device. The movable cleaning device comprises furthermore a cleaning part, preferably formed by a wiper part, for at least partly cleaning the outer surface. The driving part is furthermore for driving the movable cleaning device to have the cleaning part at least partly clean the outer surface of the optical element. The image recording device is adjustable between a first condition in which the image recording device allows at least partly introducing or taking out the engaging part of the movable cleaning device and a second condition in which the image recording device prevents the engaging part of the movable cleaning device being taken out or being introduced.

A rotary cleaning tool assembly for cleaning difficult to clean articles includes a housing that defines an interior space. A power module and a motor are coupled to the housing and are positioned in the interior space. The motor is operationally coupled to the power module. Each of a plurality of cleaning heads is selectively couplable to the housing so that the cleaning head is operationally coupled to the motor. The motor is positioned to rotate the cleaning head to clean an article.

The invention relates to an image recording device for a body of a motor vehicle. The device comprises a housing part, an optical element having an outer surface, and a driving part for engaging an engaging part of a movable cleaning device. The movable cleaning device comprises furthermore a cleaning part, preferably formed by a wiper part, for at least partly cleaning the outer surface. The driving part is furthermore for driving the movable cleaning device to have the cleaning part at least partly clean the outer surface of the optical element. The image recording device is adjustable between a first condition in which the image recording device allows at least partly introducing or taking out the engaging part of the movable cleaning device and a second condition in which the image recording device prevents the engaging part of the movable cleaning device being taken out or being introduced.

In a method for protecting heat exchanger pipe in boiler systems having at least one heat exchanger pipe, which is surrounded by a ceramic component, into which flue gas is directed from at least two opposite sides, gas is introduced between the heat exchanger pipe and the ceramic component.