fuel injection treatment?? 420 rancher

ive got a question for anyone who may have made the same mistake. i messed around and accidentally put gas+oil mix [like what youd put in your weedeater] in my rancher,...i usually wouldnt have made this mistake but my dad got a new gas can. ok cut to the point, it was probably half a tank and i already had a half a tank of regular in there so it had to have been pretty diluted......no smoking or any problems since. ill put a new plug in soon but you think i should put some lucas fuel injector cleaner in there to be sure? ive never heard of anyone doing this but i dont see what it would hurt.....your opinions or experience?