Originally Posted by Bobby_M
What you're doing is fine but you can also drain a little bit of the wort through prior to chilling and dump it back into the kettle. Boiling temps do a pretty good job of killing nasties.
I do this throughout the boil.
After use, I also do a good job of cleaning out the kettle and I flush a lot of hot water through the valve, and then flush some star-san through.