I don't necessarily think any sport is "cleaner," but the over-the-top thermonuclear doping with veterinary medications is long gone except for the desperate. I think we're seeing a lot of sophisticated PED regimes that are undetectable except in the event of a real screw-up.
I'd bet there is a ton of doping in football (soccer). The contracts are so big that there's plenty of money to fund individual programs; the seasons are getting longer and the pressure to stay "match fit" is higher and higher. Any edge that will keep a player in the game longer is a huge benefit. Same with tennis.
To the subject of this thread: one thing that's interesting about Pog is that he can do different disciplines without taking away from others; i.e. winning Flanders but still dominating in the high mountains. That is an amazing natural adaptation ability, whatever else he may be doing.