Poop Scrubbing

We have been potty training for 23 years.  OK, not really, but it feels that way.  It has only been TWO!  This sounds discouraging and oh so wrong, but at this point I think my 1 1/2 year old will be fully potty trained before my 3 1/2 year old. I understand that some kids on the spectrum will never fully potty train, so I am thankful for how far we have come.  But this is getting really frustrating and tiring.  I wrote a post back on January 24th of this year saying I thought he was potty trained but that I didn't want to jinx it.  The fairy in charge of jinxes obviously found that post and decided to screw the hell out of me! Here we are, 6 months later and I am still scrubbing the crap out of underoos, literally. He's got pee down.  We haven't had a pee accident in about a month.  But the poop.  Good lord.  The poop.  At the time of that last post I just mentioned, I was trashing poopy briefs and just buying new ones.  But that ended up costing more than Pull-Ups and he still could care less about crapping in his underwear. Please tell me I am not the only mom who is scrubbing poopy underwear?  This is just miserable.  A few times the bribe of fireworks got him to go in the toilet, but that fizzled.  We have tried just about every reward and every punishment I can think of!