Perhaps it could be viewed as a "cop-out" Paul, but the fact remains that most of these products, if used correctly, will perform somewhere between adequately and well. OK, the secret isn't so much the product as the technique.
Today at the BICSc event I mentioned earlier, an instructor from a college demonstrated with this type of product and it performed 100% on a wool carpet.
So is it the product that causes damage? I don't think so. Most of the time the end user does not absorb the spillage, applies too much product, rubs it in too agressively and causes pile damage. The stain often still remains. Then they fail to remove the residues.
Yes, it is possible for the spotting solution to damage the colour, fibre or yarn, but that's why the instructions state that tests in inconspicuous areas should be completed first. Often, they're not.
Then we also have the instances when "Super-Suds" carpet spotter is expected to perform miracles like on oil and grease, tea and coffee etc. etc. Not even the professional products are that versatile.
Advertisers have to be so precise these days with anything they claim, and the consumer, me included, interpret the claim in a way that wasn't stated. An example is a woman buys a beauty product because she believes it will remove her wrinkles. It doesn't. The advert says that it will ".....reduce the appearance of wrinkles". Can you see where I'm coming from?
Safe and happy cleaning
Ken