I don't know about Europe, but here in the states you can buy a metal pail of carb cleaner and it comes with an internal basket, you lift the basket up and out, put the carburetor in the basket, drop it in the solvent and let it soak overnight, pretty much loosens any gunk and makes it removal able with a clean rag. And you reuse it several times if you make an effort to degrease what you can on the exterior. I have had the same can of it for 20 years, and it's still good. I'll see if I can google it up. There we go, carb_clean BTW, I thought our fuel was bad, but what are they selling you there?