I don't know about Finland, but in the U.S. most drug stores carry it. It used to be used for cleaning wounds.
OK - I just googled hydrogen peroxide and found this. Important to note - you have to use it right away because hydrogen peroxide degrades quickly when exposed to sunlight. That is why it is sold in brown bottles.
However - it IS a bleach. But because the stuff that is sold to consumers is usually just 3% hydrogen peroxide, that could be why people have not had problems with discoloration of carpet or furniture. But I'm with trillcat - you should definitely try it in a spot that's not noticeable first! Leave it for a day or two to see what happens.
Here's the link, if you want to read up on myths and truths of uses for hydrogen peroxide: http://www.truthorfiction.com/rumors...n-peroxide.htm