To reduce fat or oil, fat mop it.
Just dip fat mop in the grease on top of your gravy, casserole or soup, fried food, take away or ready meal, move and see it mop up the excess.
Then use the collar to wring out the fat.
You don`t need to touch the grease.
Fat mop is a handy 33cm long, and works up to 193c or 380f (ie great for floating fat but careful with boiling fat and heated surfaces.)
Clean up in dishwasher or handwash with detergent.
If you see liquid fat, fat mop it.