I did actually use stazon cleaner as well. My bad for not listing it.
The cleaner is used on a tissue or Q-tip to soften the sharpie. If you look at the sunsets in my tiles or the water on the boy w/ the sandcastle you will see a mottled effect. That is from coloring w/ the sharpies and then sort of pouncing w/ the tip of the stazon cleaner right onto the ink.
You can also color a Q-tip w/ your sharpie and then dab it w/ the cleaner and sort of water color w/ it. The look is not as dark...very soft.
HTH,