Remembering this video some time back, I held my hotel room drinking glass up to the light at the Anchoarge Hilton last night. Three of the four glasses in my room had lip prints or other ‘unknown’ spots, smears & smudges. I decided not to chance the fourth one. Fortunately there was a paper ‘travel’ cup for the coffee. I used that instead.
Be sure to look carefully before using a hotel room drinking glass. Although, after seeing this video – I generally just avoid using them altogether!