We know that alcohol is polluted in Islam and also we know that some perfumes has alcohol in their mixture, so I want to know if using such perfumes is Haram or not?
Use of perfumes in general is permissible. And the same ruling applies for perfumes which contain alcohol. This has to do with the fact that alcohol is not najs (unclean). The prohibition is on the consumption/drinking of alcohol.
Therefore, so long as the perfumes doesn't contain anything unclean it is permissible to use them. But is impermissible to wear perfume/cologne (for women; not sure about men) in order to attract/excite members of the opposite sex.
Question: Is Ethanol of the family of alcohol that causes drunkenness? What about using this and other families of alcohol that are synthesized from petroleum and are used in perfume, medicine etc? Are they najis and cannot be used during prayer?
Answer: According to Grand Ayatullah Sistani alcohol is taher (ritually clean) but it is not permissible to drink it. Using perfume and medicines mixed with alcohol is permissible. [source]
Question: Is it permissible for a woman to wear perfume when going out of her home?
Answer: It is permissible for a woman to go out, wearing perfume even if non-mahram men can smell her perfume; in so doing, she should not aim to arouse or attract such men. [source]