Things like cleaner shrimp and UV filters may be useful in controlling, but not eliminating ich.
Not sure about red slime remover - red slime (cyanobacteria) is a bacteria. The remover works because it is an antibiotic (erythromycin). Ich is not a bacteria and therefore should not be affected by the red slime remover.
Many so called ich "cures" are only claimed to be so because the aquarist sees the telltale spots disappear after usage of said cure. As mentioned, this is most likely the parasite simply cycling into another stage of its life cycle which is microscopic. It often remains so until another breakout when the fish become stressed for whatever reason and the parasite multiplies again and becomes visible.
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