That brace going across with rust on it. What is that called. Under my car that is the only rust I have. Can I take it off or replace it?

Unless the structural integrity of the brace is compromised as a result of really bad rust, I wouldn't bother. The same thing is going to happen to the new one in short time. It can't be too bad anyways if it's the only part under your car with rust.

How does Deep Creep work compared to AeroKroil? I threw my PB Blaster away after getting some AeroKroil.

Never tried Kroil. I've read fantastic things about it online though. Kroil is (at least for me) a lot harder to get than Deep Creep and Kroil costs over 4 times as much per fluid ounce than Deep Creep.

I can grab Deep Creep at Advanced Auto for about $7 per 12 oz can using coupon codes. I haven't been able to find anyplace local that stocks AeroKroil and it costs $20 for a 10 oz can online not including shipping (about $26 per can with shipping).

There are a few particular things that I like about Deep Creep.... ONE, that you can use it in conjunction with a torch and TWO that it doesn't eat rubber and gaskets/bushings/seals or damage plastic like PB Blaster does.

Same here, I could only find Aero Kroil online, and Advanced Auto is a mile from my house and I also use the coupon codes to order online and then run down and pick my stuff up. Big fan of Sea Foam liquid and spray.

Next time I do an Advanced order, I'll pick up a can of Deep Creep and put it up against Aero Kroil in a "pepsi challenge" of rusted bolts when I start changing my exhaust out.

Honestly... for most exhaust bolts, I just cut them off with a cut-off wheel. It's not worth the aggravation, time and chemicals to get them off. You would be replacing them 9 times out of 10 anyways, so just cut them off. The only exception for me is with stud-type oxygen sensors.

AirKroil > PB Blaster by FAR

I work in a Oil patch valve shop. I live near the Gulf Coast and I have seen some crazy rusted stuff and the ONLY THING that would break it out was AirKroil. It's not cheap, but it's worth every penny in time and frustration saved. Spray it and leave it for 24hrs, then go at it.