How to sell my junk car for cash. It’s easy just call we buy junk cars at 561 420-0507. We will ask a couple questions about the junk car you are selling like location, condition and mileage and so on. Then we will give you a cash offer over the phone for the junk car. This junk car offer includes free towing. If you like the offer we will come with a tow truck give you cash and tow the junk car away. Thats how to sell a junk car for cash in Palm Beach County.