Use that information to make decisions about what to clean and fix. To me, someone who says they ‘just had the brakes done’ means ‘there are other problems, but I did this thing which you won't qualify for any warranty to have fixed in the future.’ You spending money to sell your car makes me far more curious as to what you didn't fix and what I will have to in the near future.
I'm assuming that there's problems with the vehicle, hence why you're not hitting up your social media to sell it to a friend for their kids to have as a first car. If that's not the case, why not do that first? Or check with the mechanic who has been servicing the car - see if they know someone who's interested in buying it. Your own social media is likely the quickest and safest method to sell a reliable vehicle.