Went to Ace Hardware in Fullerton and asked the sales person if they had something stronger than Drano. They had the "stuff" Alana suggested getting. The sales person said, "you want the acid." He went to a back room and got a white container (below) covered in a plastic bag. The acid was $10 bucks.
Gonna try a pressured device first before I try the acid.
"Flush Out" the acid from Ace