Generator Won't Start

My propane Onan is notorious for not starting after sitting. We have mud wasps that love the smell of propane and they go up a black rubber vent house and deposit mud and clog it. I have to then use a coat hanger to snake out the crud and clear the line and it fires right up till the next time. To fight this I put a golf tee in the line which works great till the next time you go to use it and it won't start cause the line is plugged with a golf tee. DOHHHH, made me laugh. But easier to fix.