Stihl 023 chainsaw issue

Hi there. We have an issue! In a weak moment, my uncle managed to pour some housewashing detergent instead of fuel on our Stihl 023. He pulled a few times before realising the catastrophy. Its an old machine, but as it has served our family for approx 30 years, we would like to try to fix it. Would this make sense? Any short guide on this? I am fairly handy, but of halv of all internal parts needs changing, there's no reason to save it.
Thanks in advance!

Hi! Once, my grandpa did the same thing. I just cleaned all the internal parts of the chainsaw and all was good. But now i use electric chainsaw (Ryobi - www.bestadvisers.co.uk/electric-chainsaws). It's more ecological, than other