Slippery Soap, usually called Slippery for short, is a main character on Blue's Clues.
Slippery is a bar of soap. That's it, not what you expect.
Slippery is a mostly light lavender rectangular bar of soap that has rounded edges, a smaller-shaped dent in the front and back, and a pair of arms with three fingers on each hand. He has a pair of black eyes and a pink mouth. He is always surrounded at the bottom by a trail of translucent bubbles of various colors (usually purple).
Counting the opening and credit sequences, Slippery has appeared in every episode of Blue's Clues. His first appearance was in "Snack Time". He officially appeared in the series starting in "What Does Blue Need?", where he was the third clue. His last appearance on Blue's Clues was "Bluestock". He makes an additional appearance in the "Behind the Clues" special.