The Nitty Gritty is the way to go. Not super-cheap, but you only have to buy it once. And it is way cheaper than a VPI cleaning machine.
http://www.nittygrittyinc.com/
You can also put "LAST" solution in there. That stuff is getting expensive, but I think it really does do what it says it does.
http://www.lastfactory.com/record_care.html
