Long before there were automatic dishwashers, with water temperatures up near 160 degrees, glassware was dipped in warm, soapy water and then towel-dried. On a very strong suggestion, this would definitely be the routine for cleaning the following red glass.
As shown the last couple of days, here is another souvenir from Fowlerville. The top edge of this glass is irregular in shape and the red and gold shown were added after the glass was made. Probably somewhat like painting.
There was no note as to where this glass was sold or given away as a souvenir, so if anyone has information or thoughts, it would be great to hear from you.