| CPC A47L 9/2826 (2013.01) [A47L 9/30 (2013.01); G01N 21/3554 (2013.01); G01N 21/359 (2013.01); A47L 2201/06 (2013.01)] | 18 Claims |

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1. An automated cleaning system, comprising:
a first illumination source for emitting radiation at a first wavelength in the short wave infrared range (SWIR) towards a field of view (FOV);
a receiver operating in the SWIR to acquire SWIR image data based on radiation reflected from elements located in the FOV; and
a processor for determining, based on the SWIR image data, presence of water-based liquids in the FOV, wherein the receiver comprises one or more germanium (Ge) photodiodes (PDs).
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