I took a few weeks and with the help of a lot of Seventh Generation Multi-Purpose Cleaner I managed to get a few of the cupboards clean enough for storage and a wipe down the stove so it was only slightly covered in grease.
That's the way it stayed for a year. I left the other cupboards for dead. So did the roaches we spent months killing off. All was working well, but the stove always had a glean of gross on it. More so as I started cooking myself and used oils, butter, cheese etc for my cuisine.
Until today I had a stroke of brilliance as I washed my pans. I soak my pans in undiluted dish soap to degrease them. Why could I not do the same for my stove? So, armed with Palolive orange soap I attacked my stove. Lo and behold - the grease is gone. It's not sticky to the touch anymore. I'm not afraid of setting it alight when I turn on the gas. My stove is clean!
And it only took me a year to figure out how to do it.