before you pull toilet, confirm does it flush well with a bucket of
water??????

if not pull toilet.........

if it flushes fine with a bucket pulling toilet will do no good at
all.............

muriatic acid placed carefully will clean out the interior passages of
the toilet 20 minutes and 10 bucks if you need saftety glasses.

safe effective fast and cheap. works amazingly well as another poster
reported here, i am the one who told him about it