Oh no! XD At least that stuff is washable, haha. Mine has a lot of foam at the top, too. If you let it sit for a while, it'll go away, but it comes back after you shake it up. We just left a little extra space at the top of my bottle to provide room for the foam. Once you're satisfied with it you can superglue the lid shut, but we have some we just leave screwed closed for experimentation purposes, lol.
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~Lu