Walmart offers the Meguiar's Quik Mist & Wipe Detailer 16-oz. for $3.60. Opt for in-store pickup to dodge the $5.99 shipping charge. (Amazon and Target both charge the same with orders of $25 or more.) That's the lowest price we could find by $4. It's pH neutral and removes harmful contaminants before they damage the paint. Update: The price has increased at Walmart and Amazon, but Target still offers it for the same price.

Also available is the Meguiar's Quik Mist & Wipe Detailer 32-oz. for $6.71. Opt for in-store pickup to dodge the $5.99 shipping charge. (Amazon charges the same with orders of $25 or more.) That's the lowest price we could find by $4.