I'm wondering if you're asking how to clean the wheel rather than the ink cartridges ('cause you really don't clean the ink cartridge).;) After using the wheel, I disengage the cartridge so that it's no longer inking the wheel, and roll it several times on scrap paper to get the excess ink off of it. Then, some wheels clean very well by rolling on the stampin' scrub, others I take off the handle and simply wash off in the sink. If you're using black ink it will stain the rubber, but after it's clean won't transfer to your next project.
As far as colors of ink, you could try brown for the dog wheel and maybe pink or blue for the baby wheel. If you have a variety of stamp pads, you could try running the wheel across the ink pad (it will cover a 1/4 sheet of cardstock) to see what colors you like and use the most w/ it, then if you use a certain color a lot, order the ink cartridge in that color.
Lisa
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