Ahhh Marmalade... the Fridge Method aye! That's Science, mate. Science! I'll give it a go ;-) I also bought recently that yellow Spin Clean US record washer kit. It's expensive for what it is, and it's totally manual, but damn those records sound great afterwards. I never realised there was so much dirt lurking there in the grooves...
Limited edition of this came in a wooden cover. Yes, that's right: the cover was made out of wood, with a paper insert that reproduced the sleeve details above.