What you described is exactly what smegma is. Its a thick, cheese textured sticky substance, usually white or yellow in color that collects under the foreskin between the head, and just behind the corona (ridge of the head). Its completely normal in intact guys (uncut).
Smegma is a mixture of dead skin cells, oils, sweat, pheremones (genital odors), and sometimes a bit of excess urine and/or semen. You should retract the foreskin while in the shower and wash the smegma away with water and just a little bit of soap. Doing this daily should keep the odor minimized and non-offensive (although there will always be a slight odor). It is normal for more smegma to appear everyday.
If you still have a powerful fishy odor from the foreskin and excessive smegma even after washing daily, you may have a fungus infection under the foreskin. Fungus infections can be treated with anti-fungal ointments prescribed by your doctor.
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