If you have to search a website (ex: Amazon) you don't have to log on to do a search. Do it from a private window. If you use a private window, nothing is cached, especially your search history. Your IP address is still visible, but there are no tracking cookies to refer to the next time you you go back. Different websites do things differently, you have to do a little trial and error and see who does what to whom. Or pay for a VPN service and hide everything.