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No idea on the Castor oil....never heard of anyone using it. I don't even know if it's water soluble. You can pick up a bottle of Murphy's pretty cheap, and mixed up it will probably last you for years. I've never heard of it leaving a residue before. It is all water soluble, so there is nothing to create problems as far as I am concerned.
There are lots of things out there to accomplish the same task....this is just one that has worked well for me.
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