Online soap store DigitalSoaps has a product just for us Sega fans who hate washing ourselves with non-Sega themed soap bars. Their Sonic the Hedgehog 2 themed cartridge soap looks incredibly realistic to the real thing and is even scented like grape soda just my actual cartridge!
The soap will run you $7 plus shipping and they also have a Genesis controller soap for $12.50 which you can combine shipping with. They’re tagline does sound kind of familiar… “DigitalSoaps. Now You’re Playing with Shower!”