Too much foam any damaging to carpet

The product does remove fresh stain, however, it produces too much foam and seemed to lighten the colour of a dark brown rug. I noticed the next day that the spot I had used this product on appeared a few shades lighter.
Not sure if others had this experience or if the issue is with my rug, but I would definitely recommend doing a spot check before using this product on a large area.

This stain remover looks like it will be super effective, the aresol can has a brush built in and with the push of a button the spotlifting product can be applied to the stain. After two attempts at stain removal I have concluded that the brush is too soft, I found I had to scrub very firmly and a lot of foam was produced, so much that is had to wipe the excess with paper towel . After a few minutes of scrubbing the stains were still visible. The stain were related to dog accidents, and dirt marks from suitcases left on light colour carpets. I would pass on purchasing this product again.