I accidently put an oil-gas mix in my lawnmower, what do I do?

I accidently put a 40:1 oil-gas mix into my honda lawnmower. What do I need to do to fix this? Will it damage the mower?
I accidentily put a 40:1 gasoline-oil mix into the gas tank of my honda lawnmower. What do I need to do to fix this? Will it cause damage to the motor?

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