i THINK i bought my first box of Borax after reading Whirlcools recommendation. it works great on smelly stuff, like damp towels, or old pillows. works best it seems in warm or hot water. you can use an average amount of unscented liquid detergent and the recommended amount of borax and the load will be very fresh without being scented. also good for loads with lots of socks or undies where very hot water, heavy perfumes or bleach is not desired in the wash procedure.
might be overkill if you use a premium detergent like Tide, but if you prefer cheap liquids, try it!