If nothing you've done has worked at all then they're probably solvent based
stains.Try amyl acetate (nail varnish remover as a substitute), White
Spirit, Dry Cleaning solvent or/and petrol and one of these is likely to
have some effect.
Hope this helps
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I agree with you 100%. Drilling case and laying pipe is hard labor. He
ought to ask if they need an obstetrician out there on the rig.
Obstetricians wear blue scrubs so they don't have to worry about blue
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