I use a medium size steam cleaner, a stiff brush, simple green and a lot of elbow grease. The steam cleaner softens oils and such and the simple green keeps it in suspension. I tried it without the sg and lots of gooey things will redeposit as it cools. I wipe up with a case of blue paper towels from Costco. It’s a lot of work, but deep cleans as well as I know how. Next time is mostly easier. Mostly.