Share 'FUEL ADDITIVES...WHICH IS BEST'

I AM HEARING BIOBOR IS BAD, AS IT LEAVES THE GUNK IN BOTTOM OF TANK.....PLEASE TELL ME OTHER GOOD OPTIONS.....MY TANK IS COMING OUT AND POWER WASHED...WANT TO START W NEW FUEL AND OFF TO A FRESH START. WHAT ADDITIVES ARE ALREADY IN THE FUEL WHEN YOU GET IT? WHICH ONES CAN YOU USE TOGETHER? THANK YOU...ANY ADVICE IS APPRECIATED.