Hi Matthew_Wai,
One file on a site means an infested site that could then infest users that come to visit that site. Do we want to infest visitors of our site. No, we do not. So we have to cleanse the files first, yes even when there is one infested file, and then the site can become unblocked and visitors can come again to the site.
Is that so hard to imagine? 是這樣的,很難想像?
polonus