On Wed, 15 Jan 2014 20:55:47 -0500, wrote:

Pix:
http://s1201.photobucket.com/user/sh...dirty.jpg.html

I replaced the entire valve assembly and the flapper.
Still, the toilet dirt lines appear, as can be viewed on the pix.
What should I do next?
tia

Read this link carefully about using muriatic acid to clean the bowl
rim jets. Carefully if on a septic system as it requires baking soda
to neutralize the acid before a flush.

The "dirt" - slime is coming from the rim bowl jets.

http://www.wikihow.com/Fix-a-Slow-Toilet

Plenty of old threads in AHR about it. You could use some muriatic
acid in the bowl, brush with a nylon toilet brush, the stains will
come back sooner, unless the rim jets are cleaned.

Side view of the rim jets (flush passages), etc.

http://www.hometips.com/wp-content/uploads/2012/06/toilet-plumbing-diagram.gif