Hiya lovely possible addition to the family. Oscar used to get car oil in/on his coat

he was forever going under cars hence the oil although I came tot he concusion in the end it was more "grime than oil from under the cars. It came off easily enough a brush over and of it came over a couple of days, he often looked grubby to me and he was well looked after

its the white it sometimes looks odd

Oh and if you do take him/her in just be careful of the sun and white ears I would stop Oz from sunbathing too much just move him on into the shade.
Nice cat hope you all live happily ever after.