We have put a small hamster litter tray in for ours which has helped. She uses it all the time. Have you tried one for him might help. We put a bit of soiled shavings in at first and she uses it all the time now

this is the harder part, we can't really find where he uses the cage for the toilet, theres no wet patch etc.

We have one for the older girls,
we're gonna start wth the babies when we figure where they use too!!

She should be clean enough so long as she is kept in a clean cage and healthy

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I had hamsters about 15 years ago, i had one that could swim, he loved the water,(he had a mite so we had to bath him) he lived untill he was 4 so i dont think it hurt him.
Not sure if its genarally recommended though,

One of my hamsters actually drowned in my dogs water bowl when she escaped one night from her cage. She and her sister managed to get out of their cage through the bars, fall downstairs, climb over the bottom of the dog-gate at our kitchen door, run past my dog sleeping in the kitchen and into the larder where their food was one night. Only, one of the sisters came back out and what I can gather is she climbed into my dogs food bowl first which is lower than the water one and then climbed into the water bowl. My dad found her in there in the morning and when my mum came up to tell me, I didn't know whether to cry or laugh because it was upsetting and also rather funny how she managed to get in the water bowl!

My other hamsters really didn't understand sand-baths so I never let them have them, but bathing your hamster can lead to complications if the water is too cold or too hot. As bathing hamsters isn't a common thing, I doubt your hamster really needs a bath. Maybe if you really want to wash your little one, get some damp cotton wool and wipe it over him/her and have a flannel or small hand towel ready to dry and warm him/her up again but as others have said, they keep themselves clean enough so you don't have to worry about bathing them.

is yours a boy?? (this is to the op)

Cos I'm wondering - is it a boy thing his coat gets smelly/greasey so quickly when his cage is clean and cleaned every week...if so. I'm having girls from now on haha.

I actually find females smell more than males do, especially when they come into season. That's why I stick with boys

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Mine is female