Putting gas in lincoln out of a gas can but relized it was not gas but gooop????

What is your question?

now it wont start and back fires. The engine started on fire. Then when i finally got it going it sputters, chuggs, backfires and stalls while driving. I have no idea what was in my gas can and it was too late after i dumped about a gallon of it in my tank. HELP HOW DO I FIX THIS OR CLEAN OUT THE SHIT I PUT IN GAS TANK ?