If someone has remote access to my pc to fix it then can they see this if I...?

-if someone has remote access to my pc to fix it then can they see this if I clean cookies n cash right after placing the ad.

I want to place an ad on craigslist but do not want the person with remote access which means they can look in my pc and see what I have done ect...When they have remote access to your PC they are like owning your PC. They can do everything that you can do...
what about History files???? they need to be deleted too and temporary internet files???