My wife has been complaining for a long time about cleaning this toilet.  Have you perhaps had an issue with the finish on some toilets?  With this one we have to clean it constantly as stuff seems to stick to it like glue.  Flushing does not remove any of the stuff stuck to the toilet bowl.  We have another brand toilet and do not have this issue. 
 Could the finish on this toilet be bad?  Kinda hate this toilet.  Thank you