Before car washes, motorists cleaned their vehicles in their showers, resulting in motor oil-soaked loofas and drains clogged with fuzzy dice. Avoid bathroom traffic jams with today's Groupon: for $10, you get $20 worth of car-wash tokens at Pearl Car Wash at seven self-service locations. Tokens must be picked up at the City Heights or Escondido location on Tuesdays, Fridays, and Saturdays from 9 a.m. to noon.

Pearl Car Wash peppers San Diego with convenient self-service stations for automotive absolution. Customers use Pearl's water, suds, and sponges to decrud their chariots with good, old-fashioned elbow grease. Each token–worth $1 apiece–entitles motorists to about two minutes of wash time, with a full wash typically taking about four to five minutes, about as long as it takes to shower quickly or floss a horse's teeth.

This Groupon expires June 30, 2011, but the tokens you received when redeeming your Groupon will not expire.