Indiana Jones and the Phosphorescent Tapestry of Phlegm

Sometimes, the jobs [at Disneyland] require ingenuity, even for some of the more distasteful chores. For example, the Indiana Jones Adventure ride relies on nearly 1,000 black lights that shine on painted mesh screens to create floating ghost images.

But the effect is marred when guests sometimes spit at the ghosts, and the saliva ends up on the screens where it glows under black lights. Because typical cleaning products bleach the screens, David Graefen, the ride's service manager, said his crew created a special saliva-cleaning solution.