I fixed the front wheel noise on my moped, but the kick lever still squeaks and is hard to return. Can your grease or other products help? It’s an old Jog, and the bike shop suggested replacing it. Could a spray fix it?

Bell Hammer is a friction-reactive, extreme-pressure lubricant.
For best results, apply an appropriate amount of spray or undiluted solution to the kick lever where the squeaking sound occurs or where it is difficult to return, and then depress the kick lever several times.
The friction on the metal surface will be reduced as you step on it several times, which will reduce the squeaking noise and lighten the movement.
However, if the wear is severe, there may be no improvement.