ssssssssssssssssss
De-essers (software or hardware) will help solve the problem but you should attempt to find out why the "ssssssssssss" sound is so pronounced.
An experienced vocal coach can help with this.
Sometimes it's a "teeth" thing.
The best thing singers and announcers can do to prevent mouth problems is to take care of their teeth!
Nothing sounds worse on a song or hearing a radio announcer with clacking or whistling dentures or air moving through missing teeth.
Mic technique also can help.
Try going across the diaphram instead of directly into it or at an angle.
Raise or lower the mic, move it closer or futher away.
And remember, every time you add another piece of gear to the chain, the more chance of degradation there is to the final sound.