I haven't had any luck with chemicals.
I finally (this weekend) had to take the bathtub drain apart and rod it out (using a plumber's snake). This drain had buildup like you wouldn't believe! (It looked like those diagrams that show your arteries full of cholesterol
). I started at the trap and went all the way to the outside of the house.
Now it's good as new.
If there is a way to take the drain apart and snake it out that is what I would recommend.
K
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.56 @ 139 mph best
http://www.superchevy.com/features/s...hevy-chevelle/
My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524
"Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926