Thanks everybody, you're really helpful
I did today, just with water, he didn't dropped, so I went into the sheath. I didn't find the bean, he doesn't have a hard lump which should be there if he had it. Got out a lot of smegma :P
He didn't protest once, actually I think he enjoyed, he made that "scratch me" face
And in the end I just put the hose in his sheath, he wasn't too happy about it, but he tolerated it without causing me any problems :)
Thanks again everybody!