Have done this once or twice, and use the same methods as above.
Full and honest description of the car with a clear message it is being sold as spares / repairs. Pick a price somewhere between scrap value and market value and see what rolls along. Be sure to put on the ad something like ‘if you can see the listing it is still available’ too…
Be prepared for plenty of stupid lowball offers which make scrap value look appealing but the genuine people will shine though.
Personally I don’t expend any effort on questions which are along the lines of…
“Whats your best price?”
“300?”
“Is this still available”
etc. Low effort questions where the ad has clearly not been read get ignored. You can get a feel for a person and whether they are going to mess you about from how they first contact you.