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Assuming you mean electrical conductor / insulator, most bar magnets are made of solid metal, either iron, neodymium or an alloy of aluminium nickel and cobalt, so they conduct electricity. There is one type of magnet called a ferrite magnet which does not conduct electricity - they are the type often found in loudspeakers.
No, electricity does not flow through a magnet. Magnets exert a magnetic field, which can interact with objects containing electrical charge or current, but they do not conduct electricity themselves.
Some magnets conduct electricity quite well. Others are pretty good insulators. If the magnet is made from metal, chances are that it will be a pretty good electrical conductor. If it is a ceramic magnet or one where magnetic particles are suspended in a non-conductive medium (like those flexible rubber fridge magnets that businesses like to distribute) then the magnet will usually be a very poor electrical conductor.
No, rayon does not conduct electricity as it is a non-conductive material.
Detergents in general do not conduct electricity. However, some detergent solutions might be able to conduct electricity if they contain electrolytes or other conductive substances.