I sell a lot of Bio-Clean to restaurants with grease traps.
Please don't put Draino in the drains. That's a good way to eat up all the metal and cast iron pipe.
Something natural like Bio-Clean eats up the grease all the way around the pipe and in the grease trap box.
The City of Bellevue makes resturants use products like these as their waste treatment. Too many problems with the city sewer lines before they did that.
I remember trying to snake out the local KFC Kentucky Fried Chicken. My Gawd there was a lot of chicken grease in the lines. All the snake did was stir the grease.