you'd want to use dish soap because it's a detergent and detergents contains surfactants. They have hydrophillic and hydrophobic sided molecules that will take everything off of the rubber leaving it very clean. bar soaps are emulsifiers, it just mixes the oil and water together, so after a rinse you'll still have some residue left behind. you can also use a mild laundry detergent.... but why bother just use dish soap.
I've never tried using isopropyl alcohol.
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