I think toilets are one of the most difficult things to clean really well. I have put in a lot of time trying various methods over the years. And I just plain resent the way the outsides are usually made, with all those horrible dust-catching details. The insides presumably have plumbing-related reasons why they're like that, but the outsides could perfectly well be smooth, because some models are (not that I knew that the last time we were in a position to pick new toilets).