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When I was sign lettering by hand from about 1985-1990, I always cleaned my brushes well with mineral spirits and then dabbed them in the olive oil before putting them up. It would keep them nice and supple. Then clean them before painting again of course.
I have not used them since but still have them and they are just fine, still covered with olive oil. We always used the most expensive olive oil but I forgot the name. An old sign painter taught me that. I don't think I would ever put soap and water on my oil brushes though. I would think the soap would have detrimental effects on the bristles, making them dry out.
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