How do you remove dirt streaks after carpet was cleaned?

That's funny. It sounds like the carpet didn't get cleaned. Did you pay someone to do it or did you do it yourself? If you paid someone, call them back and make them do it again. If you did it yourself, you're gonna have to redo it and make sure you go s-l-o-o-o-w (slow). Even overlap everything. Make sure you use a good cleaning product, even Oxy-Clean does a decent job. If you are attempting this yourself, it sounds like the cleaner you used is not working properly, whether it's the chemicals or machine or both. I don't like the wet cleaning methods, it just gets the carpet too wet. If you don't like any of my suggestions, consider a carpet dry cleaner. My web site talks about which ones work best. Good luck!