Percolation? Heat soak? Don't drive during summer??

Nuke the site from orbit. It's the only way to be sure.

Yea to many gurus to listen to. Its kind of like dental school though... bunch of dinosaur (not saying anyone here are dinosaurs) doctors who did certain things the same way for 40yrs, which worked for them, but other doctors did it differently so there is a little head butting.

So you usually take in all the information and find the way that works for you (to an extent).