Take the hood off, remove top covers accessing the filters and clean from the top.
hood is off been using suction gun. guess I will just keep doing that
Have you removed the filters and scraped out all of the crud that settles in the bottom?
You might need a long screwdriver to get the solidified sediment loosened
If it won't drain, there is solidified sediment in the bottom of the filter housing. It may be easier to poke up through the drain pipe than to poke around from the top and find the hole. A screwdriver is a good tool, the last one I did, I had to chip the crud out of the hole, twisting and reaming it out with the screwdriver.