Seth,
As a auto service professional, can't help but find selfrighteous diy'ers humorous when they step on their d-i- c-k !
Srtipped dran plug removal in order of personal preference after 30+ years;
1. Spline type socket as sold by SnapOn and Erwin(somebody called Sears version "Bolt Out", no personal experience, but I'm sure it's the same thing.
2. Undersized 6pt socket, if original size is 15mm DRIVE on a 9/16, original is 3/4 Drive on a 18mm, etc.
3. Small semi-sharp cold chisel to hammer into lip of drainplug in ccw direction till it breaks loose (not for the faint of heart),,,LOVE watching customers turn green while watching me do this!!!!!!!
4. Dead last, a pair of visegrips (AKA Mr. Goodpliers). Usually if it's too tight for correct wrench size, all grips are gonna do is round it down another size or two. If you must use v. grips, at least tap sharply with a small hammer instead of attempting hand pressure to loosen.
Spraying any product on a drainplug (with the possible exception of a super coolant to cause thermal shrinkage) is just about the silliest thing I've ever heard! Threads are SATURATED in oil, just trying to get out! Only thing keeping it in is the gasket on drain plug. Overtightened plug has either threads seized or gasket seized NO amount of PB Blaster (one of the finest products in the world when used in context) is gonna do squat.
Bob