Sorry, can't help with a location of a hose. However, do make sure that you use the hose sparingly and try to get the bike as dry as possible after hosing it down. Also, don't spray anything high pressure anywhere near where your bearing seals are located.
Instead of a hose, I prefer to wait until the bike is dry, then use a set of bike brushes (
something like this, you can get them from any good bike shop) to brush the mud away - the proper brushes are especially good at getting to the hard to reach places. After that, I use some spray-on bike cleaner (which you can get at the Migros Sport XX or a real bike store); leave it on the frame for 2 minutes, then wipe clean with a cloth. Then make sure the chain still has some oil on it. This method works pretty well and doesn't leave any water where it shouldn't be.