I'm with Liz on Stuff Designed for Mostly Women to Clean which have crevices and lumps which can't be reached by any cleaning tool larger than a toothpick.

Part of it is price, too. I've started noticing as I get older and smarter (or more pissed off) that, for example, a bathroom sink I can afford will have a gasket around it which will gum up around the edge, and after a few years will reveal it has collected a disgusting toxic goo under, which seeps out endlessly when you try to clean it up. An expensive sink will have a smooth easily cleaned transition between porcelain and vanity top.

Even faucets are hard to clean if they are cheaper ones, like those common clear plastic topped affairs which inevitably get scummy inside and can't easily be taken apart.

Then there are the coffeemakers. You cannot reach down into the water receptacle to clean all the weird curves and crevices (when the vinegar rinse just isn't enough). You cannot clean between those little reinforcing flanges in the bottom of the coffee grounds receptacle. And I've yet to spend enough to get one that makes the water hot enough.