does crud line galvanized water pipes and cause toilet bowels to get coated with

does galvanized water pipes cause dirty coating sometimes with slime like coating in toilet bowels? also the house is 56 years old and no leaks so far. Would this cause a problem if I wanted to sell my house? I have had city come and check and we are on the end of a main and neighbors said they have had city come and nothing gets done. Do I have a nightmare problem?

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Dotty
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