Thanks for the reply. This is what I placed in the robot text file:
User-agent: Baiduspider
User-agent: 360Spider
User-agent: Yisouspider
User-agent: PetalBot
Disallow: /
User-agent: Bytespider
Disallow: /
User-agent: Sogou web spider
Disallow: /
User-agent: Sogou inst spider
Disallow: /
Does this look correct and how long would it take before it starts to work?