I do computer cleanings all the time, or Tune-ups as I am now calling them. I have a firm (now 22pt) checklist that we go through with every cleaning. Most people love it and everything is faster, runs good and they know what's going on with their computer (things that need attention that is, like memory, hard drive space, software decisions, etc.). It's not the average person's job to know how to do cleanings. I get calls now and then from clients who say their systems are still slow, and they have done "the cleaning" themselves, but after we do our list, magically...everything is faster.
Ours are $75, but I am thinking of having my assistant upsell them to the clients who are calling in for other problems, for half the price, since we already are booking another repair, throw in a cleaning for $40 or so.
I read the article, too bad they didn't close with "Call That Girl if you don't know what you're doing and deleting important system files/directories because you want to clean up your memory) haha...
I am kidding, everyone calls their memory/hard drive space and vice versa.