I'm no pro, but I've used ovens a few times and worked great. Usually, if you have it on bake, the bottom burner is what is heating. I put the ball on a towel toward the top to keep it far enough away from direct heat. Seemed to pull out oil really well.
FYI, car can get close to 170+ F in summer temps, so if you've kept a ball in the trunk for a few hours during summer sun, you've probably exposed it to that kind of temp.
If a ball could only be exposed to 120-130F, you'd be darn near that in Vegas summer temps without solar radiation raising temps.