Many, many, many years ago, I made some of these dishwasher  clean/dirty signs as Christmas stocking stuffers for family.  Since it  was so long ago, I can't remember if this was my own creation or if I  saw it somewhere in a magazine.  Either way, now that I have a working dishwasher, I decided I needed to make  one for myself so I could remember if the dishes in the dishwasher were  clean or dirty (you would think that since I'm the only one that lives  in this house, that I would be able to remember.  But, actually, since I  am the only one here, I don't need to run it that often, so sometimes I  forget).   (Also, please  excuse the bad night time pictures).
Here is a list of supplies you will need:
*An old CD that you don't use anymore
*Decorative paper (I used scrapbooking paper) and other embellishments
*Scissors or a circle cutter
*Crop-a-dile or something to punch a hole through the CD 
*Mod Podge or some sort of adhesive (I ended up not using that  scrapbooking glue in the picture), but I strongly recommend the Mod  Podge.
*Magnet or suction hook or other type of adhesive (I like the 3M Command brand - it's easily removable) to attach the CD/sign to your dishwasher
1)  I  don't have a circle cutter anymore, so I traced the outline of 
the CD  onto my scrapbooking paper (on the backside) and just trimmed it
 up to  fit the CD. 
2)  I decided I was going to use ribbon in the middle to  separate 
the "Clean" and "Dirty" sides of the sign.  I  attached the ribbon to 
the scrapbooking paper first.
3)  Then, using a  sponge brush, I put Mod Podge all over the CD and put the paper onto it.
4)  I then added letter stickers to it and made sure that they were facing the right direction.
5)  Once  the letters were on, I put more Mod Podge on top of it.  When I
 made  these several years ago, I didn't know the wonder of Mod Podge 
and  didn't seal the paper with anything.  Well, because of this, the 
sign  wasn't very durable - as water accidentally got on it, the paper 
was  starting to tatter or tear.
6)  Once it was fully dry (which didn't take too long), I used my handy 
dandy Crop-a-dile to punch the holes.  It punches through the CD like 
buttah!  (you can see a sneak peek of one of my other project I did tonight that I'll be posting tomorrow).
And here it is in action.  Ta da!  
Now, I just have to figure out how to get the suction hook to stay without falling down every 20 seconds (magnets don't work on my dishwasher).  Sigh...