Limpio (Spanish for “clean”) comes from the Latin limpid (“clear”). The transition is easy to see: cleaning something is broadly, making it look clear again, right?
From that same Latin root, we also get the English lymph — as in the lymph nodes we studied in high school biology. What is a lymph? The clear liquid circulating in the body. Oh, there it is again: it’s clear.
The l‑m-p root is clear in all!