Clean the terminals again first . . then if it still doesn't crank get a multimeter , or just a simple test light hook it up to the battery post (Not the terminals ) , did you get about 12. volts ,
If not get a good working battery,but if you did
.. test your connections from the battery to the terminal . hook the test light or meter up to the negative and the positive WIRES . If you didn't get any volts or your test light didn't light up then your not getting a good connection at the terminals .
I think the terminals are just loose or need clean .