我的同事说用 WD40 (home depot, walmart etc) 可能会有意想不到的效果:
喷上 WD40, wait 15 mins, then use the regular detergent or carpet cleaning things and water to wipe the area out. But he said that's mainly for oil type of stain. wouldn't hurt to try.
我从来没机会试过, 要是用了的话请上来报告一下哈.