Swimming pool acid works pretty good also. You have to be very careful though and have lots of ventilation. I use it for the washing machine drain once in a while.
My tub would never drain right after I had the bathroom remodeled and I finally pulled the trap and along with lots of slimey stuff I found an old gasket the dipstick had dropped in when he replaced the tub.
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“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.”
― Calvin Coolidge
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