Water and oil repel each other.
Nonpolar substances that repel water molecules.
They don't attract, in fact they repel, which is why oil and water separate when left for a period of time.
Cedar oil is said to repel them and there are sprays, etc out there.
Rain (water) is a polar molecule. By introducing a non-polar molecule the two will repel. This is why water and oil, no mater how thoroughly mixed, will eventually seperate. Rain-x is composed of non-polar molecules.
A lipid is not soluble in water. Lipids are hydrophobic which means they repel water. For example think of a oil tanker spill the oil is a lipid and it floats on top of the water.
Hydrophobic repels water.
Surfactants is what makes detergent work. Surfactants are molecules, and they work with the water to repel oil, and grease.
The scent of the citronella can repel mosquitoes, depending on concentration. The oil can also be used to smother larvae and eggs.
All substances that are water repelling are considered hydrophobic substances. Ex: Oil, Waxes, etc..
Olive oil, and other oils, is a member of the lipid family. Lipids also include fats and waxes. Lipids are hydrophobic. That is a fancy word for saying they don't mix with water. Lipids are made by covalent bonds that repel the ions in water. The membranes around your cells are made of fat so that the water on the inside and outside will repel it thus creating a wall.
All things that repel water are called "hydrophobic" which is a latin term. Hydro, meaning water, and phobic, meaning the fear of. So literally they are water fearing. Something that does not repel water is called hydrophilic.