You can also buy ethanol from wholesalers, goes nice with tonic
Paraffin best and cheepest by far Not sure exactly but think is safer than petrol if you get it on rubbers - like brake hose but would stear clear of those to be sure
If 'Gunk' is good then 'Gunk Ultra' should be ridiculous...http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_154909_categoryId_255222_langId_-1?cm_sp=Intelligent_Offer-_-Product_Details_Zone_1-_-Blank&iozone=PDPz1