stain worse. instead, gently dab the spot with a white napkin, or do nothing at all.clean only" means you have to dry clean it? >> no. >> reporter: that's right. secret number five, labels lie! for certain fabrics, like cashmere sweaters, handwashing is just fine. as long as you don't put it in the dryer. but there's one more secret that gets us women hot under the collar. and secret number six, the gender gap. what did you think when you got the bill? >> i thought it was a mistake, i mean, it just doesn't make any sense. >> janet palmer was hotter than a steam iron when she discovered the dry cleaner charged her more than her husband to clean shirts. >> >> exact same shirt? >> yes. >> different size? >> yes. >> two dollars more. >> yes. >> reporter: outraged, palmer decided to call 50 dry cleaners in new york city. and while we can't say its true everywhere, she found women on average paid 73% more. 73% more for what? >> i have no idea. >> what would happen if you put a women's shirt on there? >> it just wouldn't fit. >> it's not sexist, it's economics. women's shirt