If you have removed and cleaned the Negative cable where it attaches to the Frame and the other Battery cable ends, try to find a multi terminal connector near the Ignition switch. Open it and look for crusty greens and spray it with Electrical connector fluid. Carefully put it back together...
Please STUDY the Manual if you have one. Drain the Float bowl if you are able carefully replace it marking the Orientation if you do. Some bowls have an obvious drain. Snowblowers do not have air filters. Studies have shown there is no dust during snow events. Drain ALL the fuel out of the...