How do I COMPLETELY delete my browsing history?

Okay, so my laptop has been experiencing connection problems for the past couple of months. On Friday, we are taking it to get fixed. The bad thing is that I've gone to some....well......let's just say I've gone to some websites I probably shouldn't have. We started discussing the connection problems and my brother... show more Okay, so my laptop has been experiencing connection problems for the past couple of months. On Friday, we are taking it to get fixed. The bad thing is that I've gone to some....well......let's just say I've gone to some websites I probably shouldn't have. We started discussing the connection problems and my brother and his fiance both said that when you delete your history, it doesn't actually go away. It just goes into a seperate file that the computer people can access. First of all, is this true? Second, if number one is true, how do I permanetly delete it? And lastly, would the computer guys even look at my history when they operate on my laptop?
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