Bleeding a radiator

Sometimes, when heating radiators start making weird noises, you need to bleed them (finally found out what the English term is ;) ), and I hate doing it. But I have a central heating system that requires me to do it about once a month in winter, so I have to do it. At first, I did it with a cup and the super-tool everyone has: a square kind of key. The result, after doing it, was that my hands were really smelly, and I had to wash them multiple times to get the smell off. Yuck!
So I made a tool that would make my life so much easier: I call it the 'Anti Icky Water Bottle', or The Bottle for short. Here's what I did:"