The Sanskrit word for "cleanse" is "เคถเฅเคฆเฅเคงเคฟ" (ลuddhi).
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Yes. Cats will often eat grass to help aid the digestion process
and to also cleanse the stomach, usually to help rid themselves of
hairballs.
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A liver cleanse kit can be bought at a pharmacy like Duane Reade
or Rite Aid. These kits are very expensive and can purge your liver
of all foul materials.