[robinson-wall]

I bought a device with some kind of cloth pads held opposite each other, and when you close it they brush up against an inner pad which presumably removes grease from them.

It cost £20 and I was dubious about it, but it cleans better than I've ever managed by myself with a spray. Lasted about 1.5y before it stopped being effective (just moves grease around rather than picking it up) and I went and bought another one.