I have two Mercedes running blend(33% Bio B99 / 66% WVO)and at first the blend loosened up all the crap in the tank. I changed prefilters pretty regular till it works all the stuff out.

My question: Is there a better way to this without pulling the tank? Additive to clean it all out?

The only right way is to take the tanks out and go to a radiator repair shop. They will get the crap out. I did this to 3 300's and it worked. It was cheaper to just put new tanks in my 93 crewcab as the radiator repair shop went up to 75.00 to clean them and the tanks were only 100 bucks apiece.