You' remember Luke. He's about six feet four tall by one foot wide. A most pleasant fellow.
Not all records have spent their lives sitting demurely in clean, civilised households, and the onslaught of dust, dirt, smoke, greasy finger marks, beer spillage and whatever to which many have been subjected is probably more damaging than canal water. Washing them in tepid, soapy water and wiping them round with a J-cloth usually removes much of such residue; the next stage up is applying lighter fuel to them and wiping them vigorously. For tough stains, isopropyl (sp?) alcohol can work wonders.
I have heard of the method which you mention but have never invested in that type of equipment.