This may not be the approved method but until I can actually find the tablets or the brush....
1)I rinse mine out with hot water
2)I then fill it about half way, drop in a little soap and shake vigorously
3)Rinse it out a few times
4)Then I dry it out as best I can with a paper towel
It has worked well for me... Of course I have never filled mine with alcoholic beverages... yet...
I miss MCB.... Where the hell am I?!?!?