May be a stupid question, but does your scope actually have a cross HAIR? A lot of "cross hairs" are not actually crossed wires (think, how would you wind a MIL/MOA wire???) but rather etchings onto glass.
If it's an imperfection in an etching you won't have a problem -- more like the situation where a house owner finds a grubby fingerprint inside his new double glazing.
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