Clean when you want, lube often. Sigs like to be WET. One of our armorers went 15,000 rounds without cleaning his P229, just lubing. No malfunctions what-so-ever. He would have gone more rounds but his OCD wouldn't let him. He had to clean it.
Cleaning = inspecting, just like Clandestine said.
Cleaning = inspecting, just like Clandestine said.