A method and apparatus for cleaning, detecting, andor removing contamination from the surfaces of nominally transparent materials utilizing internal illumination of those surfaces with at least one electromagnetic radiation beam at an angle of incidence equal to or greater than the critical angle for total internal reflection. The machine has a housing, a vessel for receiving leaf tea and a hot water supply that supplies hot water to that vessel. The distillation column has an upper part and a lower part, the upper part having: a first inlet for receiving degraded oil, and a head having a first outlet for expelling light component vapor.