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Tack/feed stores carry the kind I use. I think Tandy has some. You want the kind used on glycerin. I don't know about regular soap.

Paper towels , fine saw dust, anything that will soak up oil....

Without touching a piece of leather I give this advice with caution. Alcohol dries out the surface. Let's say I was going to dye a piece that had already been tanned. I would use denatured alcohol...