what are you supposed to clean with CLR? what buildup?
a toilt is just porclean nothing can go wrong with it short of a crack
the other parts in the toilet, flapper, ballcock, handle, float can all be replaced in about 1/2 an hour for average homeowner doing the job him/her self for about 30 bucks and only need a channel lock plyers
sounds like you had a idiot working on you crapper, the advice is questionable
what does not happen when you flush?
the top tank dont empry?
the top tank dont fill after flush ?
or the bowl does not drain and fills to the rim almost?