What is the riddle asking? What is the answer?
Don't lose this one, do the opposite!
But you won't need eyes to do so.
Then let it percolate, and remove any doubles.
Now we're ready for tea, and with it, our answer!
The answer is heavily derived from a play on words.
HINT 2: (may be a spoiler, check only if you're completely stuck):
It has nothing to do with tea or biscuits.
You may not need eyes, but that does not mean you have to remove any.
The answer contains only one letter different than the question.