Just do a Google search on removing malware. You'll find plenty of articles, many of which are from more authoritative sources than Yahoo news.
By the way, Malware Bytes is a free download, and is really good at catching and removing malware. But slowness can be caused by many things, and...
You can drain them, and then refill. You'll probably need two large pipe wrenches.
Be aware that the radiators are EXTREMELY heavy. And also, when you hook them up again, you'll have to be certain to avoid leaks.
Generally, it's better not to tamper with something that's working well...