I used to have this set and had a hard time with it as well. I used a white eraser (meant for chalk, but I'm guessing any one would work) and rubbed each of the stamps with it, cleaned them and stamped. It wasn't perfect, but did help. Also, I find that Stazon ink gives pretty good coverage for the cheaper clear stamps.
Hope you find something that works for you. I also used Versamark like the others mentioned and had some success with that.
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