A handheld cleaning appliance includes a dirty air inlet, a clean air outlet and separating apparatus for separating dirt and dust from an airflow in an airflow path leading from the air inlet to the air outlet. In one embodiment, the method includes the prevention of remodeling of the infarct zone of the ventricle using a combination of therapies. The cleaning composition when mixed with an alkaline compound is very effective in removing dried or baked residues of polymers, modified or natural celluloses starches, natural gels, and the like at low concentrations and temperatures. A support is preferably disposed below the heaters to support the heaters, and a power supply provides an electric current to operate the heaters. Preferably the element or the elements are mainly made from molybdenum disilicide.