Water and ethanol can pass through the membrane even though it's polar because it's a very small molecule and can under go this process through osmosis.
A process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
Water can also pass through the cell membrane by osmosis, because of the high osmotic pressure difference between the inside and the outside the cell.
This is not an easy process, because the solubility of water and Ethanol in lipid is about 1 molecule of water per million molecules of lipid.
But, the outside concentration of water or ethanol becomes very high (about 50 mol/L), and the surface area to volume ratio of the cell is very large, so this is an important cellular process.
Learn more about Osmosis here ;
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