Not too long ago there was a post about an APC product from mirachem.com and how one could get a free sample of it just for the asking. So ask I did and having just had the opportunity to use it on some set in pop and grease stains inside the family car and van I can tell you this is one great product. Knowing how bad the stains were going in I wanted to try it full strength feeling if that didn't work it sure wasn't going to work diluted which after having seen the great job it did stompin' those stains I'm sure even diluted it would've been sufficient. I sprayed and waited maybe 30 seconds or so and lightly aggitated it with a brush and the stains were gone! This is a product I plan on keeping close by not only for my vehicles but in the home as well. If you're not sure about an apc, look them up, get the free sample (no charge for shipping) and see what you think.