Uncircumsized smell?

So my boyfriend is uncircumsized. This is not a problem at all... except maybe 2 hours after his shower.. he starts to smell, and I mean really bad. I'd compare it to the smell of rotten potatoes. And I can even smell it through his jeans.

He cleans really well, and we are always looking up stuff about it to figure out why. We can only roll it down to just being uncircumsized.

Do any other men have this trouble? And what do you do?