Mac Software that Detects Windows Malware

I want to use my Mac to scan drives that have Windows partitions on them for malware. I know that there are a lot of security software packages out there for Macs but I'm not sure if they detect Windows based malware to the same extent that a Windows security software package would. Does anyone out there have experience using their Macs to detect viruses on Windows partitions and/or external drives that may have been infected with Windows based malware? What software is the best for this?