Someone helping has mixed some 2 stroke fuel in my petrol container. Only 2L of unleaded in the container (a 10L container) (and I did provide the 2 stroke container... arrgh). What should I do? Do I need to rinse out the container with petrol, or will it be OK to empty the mix into the proper container and just fill the petrol one up with petrol again? It's for the mower, ride on mower and the car.