I used to think WD-40 was basically magic for everything. Stuck bolt? Spray it. Squeaky hinge? Spray it. But last month I was at Pull-A-Part in Phoenix trying to get a rusty alternator off a 2002 Civic and this retired mechanic named Hank walked by. He watched me drench everything in WD-40 for like 10 minutes before he said "son, you're just making it slippery, not breaking the rust." He pulled out a can of PB Blaster from his bag and sprayed it on, waited 5 minutes, and the bolt came loose with a normal ratchet. I still use WD-40 for cleaning and protecting stuff but now I keep a separate can of actual penetrant for rust. What do you guys use for seized bolts that actually works?