thanks for your posting. I did yesterday, and pulled out some gloves... but it is still clogged. Right now, a plumber said he will do it again, if not fixed, I don't need to pay the 200 dollars, he will find other ways to fix it, so I let him try right now.
thank you all!!! It seems like 28 years slowly clogging plus recently baby wipes disposal into the wrong place caused this big mess. The plumber fixed it -- $230,