HijackThis - free download.
ComboFix - free download - expires, download fresh every week.
MalwareBytes Anti-Malware - the free download is fine.
SmitFraudFix - free download - take the "Clean-up" selection in safe mode.
AVG Antivirus - free is fine for cleanup - run it last after the other tools.
You need to run ALL OF THESE or you don't stand a chance (I do 3 to 5 a week right now). I start with HijackThis and may run it again last. First thing I do is disable any Norton products - they'll prevent cleanup.
Doing cleanup on-site isn't practical and I only do it in the shop. I just tell them if they want to pay $90/hr for 4 to 8 hours I'll do it there - much cheaper in the shop.
Hourly doesn't make much sense. I charge a flat rate depending on difficulty, anywhere between $50 and $250 since I go about other stuff while scans are running.
For businesses I generally sell them a licensed AVG which gets the root kit module. I see a lot of root kits protecting the infections now - ComboFix can generally disable them.
You also need Keyfinder - free download - to recover license numbers for Windows, Office and some other programs.
Keep in mind - if they have a brand name machine and you have to do either a repair or full Windows install you need the disks that came with the machine - a generic XP won't do because neither the license number on the label nor the one keyfinder finds will work except with that company's disks. Every time I get my hands on one of those disks I copy it and label what machine it was for so I can fix machines of that type when the disk isn't available.
A couple of weeks from now new tools will be needed for new infections.