How to deal with generator belt slippage:
1. First, the belt slips, usually because it has been stretched due to long-term use.
2. Slight slippage can usually be fixed by pouring water on the belt. However, what you said about spraying surface wax and applying oil to the belt is false. This will only make the belt more slippery and the slippage more severe. Only replacing the new belt can completely solve the problem;
3. Now the oil and wax need to be cleaned, and you can use carburetor cleaning agent to clean it. If it's still not clear, sand it with fine sandpaper.
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