If it's the tin can spray paint it will wash off - I guess you could try some soap suds. But use it cool; wool + soap + heat + agitation --> felt

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If it's the thick 'branding' paste used to permanently mark fleece.. well, it's a permanent mark. It will not wash off.
If it's raddle, used to mark ewes' bums when they get tupped, it will wash out.
And you know, as do we all, that it isn't the
ram lamb who's embarrassed.
