Yea, I think for plastic stuff a good thorough disinfecting cleaning should do the trick.

As far as I know, baking/boiling/steaming stuff is only needed for outdoor stuff that may contain embedded bacteria and/or parasites. I have a nice rock from the back yard that I boiled in a big stock pot when I first brought it in.

For baking stuff I think you would want to keep the temp low, but make sure it is at least boiling temp. So, perhaps 250-300 would work. Also, I would imagine you'd want to leave it in long enough to make sure whatever it is completely heated.