The Collonil Clean & Care foam I have ordered from Amazon, because I had this once bought in the store and was quite pleased. Had my white Adidas sneakers a blue jeans discoloration on the tongue, which I got on the white leather and back away pretty well, for the perfectionist like me, but unfortunately not good enough. When wearing certainly not recognizable, but nevertheless, had somehow expected more, but a miracle cure, it is then probably not. On Rauleder the whole thing designed even more difficult, you should also necessarily buy a matching shoe polish cloth to with Zewa or any kitchen cloth that's nothing ;-). Well, one needs or does not need one. As always, it is probably on the size and nature of the spot, and of course on the material. Could for my purposes (actually quite normal repairs that the shoe looks almost like new again) be a lot more aggressive, is also not exactly cheap the can. My white Hilfiger cloth shoes it was a special disaster incidentally. I was hoping the yellowing get out, this spread but then more likely to continue on the shoe. A small bruise was also blurred just got worse and was no longer blue, but faded to purple. So I would try to stuff it not necessarily because in my opinion, "exacerbation risk".