Abstract: Ultrasonic cleaning devices comprise a sonotrode and a power supply adapted to supply current to the sonotrode, and further include one or more features which facilitate use of the ultrasonic cleaning devices by consumers, improve the safety of the ultrasonic cleaning devices when used by consumers, and/or improve the cleaning efficiency of the ultrasonic cleaning devices when used by consumers.

Abstract: The invention relates to a process of cleaning a substrate, the process comprising a first step of providing a cleaning solution and a hand-held implement, the process further comprising a second step of applying the solution onto the substrate with the implement, characterised in that the implement has an active part vibrating at a frequency of at least 20 kHz with an amplitude of at least 10 ?m and up to 100 ?m, and whereby the substrate is fibrous or a hard domestic surface.

Abstract: The invention relates to a hand-held having an active part vibrating at a frequency of at least 20 kHz with an amplitude of at least 10 ?m and up to 100 ?m, characterised in that the implement has at least two configurations, a first configuration where the active part is hard, and a second configuration where the active part is not hard.