Can a Buddhist use antibacterial soap?
There istance a monk with psychic ability looked into the water and saw there were microbes and asked the Buddha if drinking will harm them. Buddha said don't look and drink.

One intention of Buddhist morality is the stabilize the mind so it is free from remorse and so it can develop concentration and wisdom. 

So if you use antibacterial soap without much thought there are microbs and intention of killing microbes then there will be not issue.