Raekwon is from Shaolin, which is the Wu-Tang nickname for Staten Island, and both of those names begin with an S, so he is from the S. In this line, S sounds like “ass,” so he should be cleaned, as he just came from an ass.
On an unrelated note, Staten Island is a filthy, Godforsaken place. Anyone from Staten Island should be cleaned by at least 5 dudes in Hazmat suits before engaging in physical contact with outsiders or leaving their landfill of an island.
Sincerely,
A citizen of the great state of New Jersey