Just wondered (after watching a TV prog on cleaners) whether anyone had tried making an improved leadersink using limonene? It's a powerful non-toxic degreaser (best source is orange rind), but the downside is it is non-polar so not miscible with water. You would need to make a mix with a surfactant and I'm not sure whether a treated leader might be more hydrophobic after degreasing than it was before? However, it might be worth trying it. I'm thinking... make up a mix of limonene, surfactant, water and glycerine, and mix to a paste with Fuller's earth...
Quick search for a 5 mL sample has so far only given me 1 L for about Ł20, so work to do there
Col