If it's yellow . . .
When I first came to the Virgin Islands about 10 years ago, I noticed many interesting sites, smells and sounds. I travelled by car and boat to other islands in the British/American Virgin Islands experiencing the best in tropical adventure by shopping, eating and relieving myself.
Let me explain, since water is a precious commodity for villas and restaurants there happens to be a protocol for emptying toilets. (not for filling them by the way)
Islanders made signage to help the unsuspecting traveller to conserve water as well as to assist in making 1 & 2 a good experience. It is written on media such as coconuts, palm fronds, and wood crates.
Next to the light switch and the T.P. dispenser what I read and what I can tell you is this:
"If it is yellow,
let it mellow.
If it is brown,
flush it down!"
You still have to wash your hands too. . . All the best!