This was my first visit to a Wiki Wiki so I wasn't sure what to expect. Now I can report that it is a very good drive-through exterior car wash combined with free DIY interior vacuuming. It is NOT a full service wash such as Autobell.
This is the company's second location and it is shoe-horned into a too-small lot in a very high traffic area near the Super Walmart on North Tryon. Four levels of service are offered, priced $5-$20 in $5 increments. IMO the basic wash at $5 is a good value, while the $20 premium wash is overpriced since it does not include interior service.
There are plenty of individual self-service vacuum stalls but on a busy day be prepared for short waits to get one. Once you drive into a space you can access a dedicated hose with an attached sturdy nozzle. The powerful vacuum can probably suck a wet towel dry, so be prepared for a bit of a learning curve. Mine kept clamping to the carpet like a leech until I mastered my own hovering technique. Signs ask you to stay no more than 10 minutes but I didn't notice any tickets being issued for violations. ;-)