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KWIL · 16th June 2021, 21:37

Works as follows. When dry an internal IR beam is by internal reflection at the glass/air surface back to a detector, when sufficiently wet some of the beam escapes and the detector no longer receives the same level and hence initiates the wipe.

16th June 2021, 21:37	#3
KWIL Precise Rover 75 Tourer 2.5KV6 Connoisseur SE Join Date: Mar 2013 Location: Fleet Posts: 2,956 Thanks: 630 Thanked 617 Times in 480 Posts	Works as follows. When dry an internal IR beam is by internal reflection at the glass/air surface back to a detector, when sufficiently wet some of the beam escapes and the detector no longer receives the same level and hence initiates the wipe.