I take mine apart every month or so. It's simple,twist the little twirly bit in the centre of the 3 heads and remove the plastic retainer. The heads drop out with their cutters. I find the groove in the middle of the circumference of the cutter gets full of gunge, as do the corners of the heads. Rinsing doesn't remove it. Perhaps that's the source of your pong?
I returned to a rotary head shaver a couple of years ago after recommendations here. I still prefer a foil head.
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