i've got a much loved matt futur and came across a youtube dis-assemble video here >[video=youtube]http://www.youtube.com/watch?v=GuDCHb9-uJ4[/video]
Surprising amount of crap under the head part
You do have to press down quite hard against the spring but it came off and went back on easily enough.
I'm another old toothbrush user and some anti-bacterial hand wash takes the worst off. I have used a small dab of three in one oil if the soap marks seems stubborn, in the past. Guess the satin finish is prone to showing these 'smears' more than other razors.
Any successful combinations you've found for cleaning yet?
Andy