Bug spray? For me, I just spray EVERYTHING on my saws off with the air compressor every week and I also spray WD-40 on everything that might have bio oil on it before I blow. I like Stihl Bio Plus for my carving saws, as well as sometimes cutting firewood. When I store my saws longer than a month, I let the saw idle with the clutch cover off as I let Stihl Premium oil run through and get rid of the bio stuff before cleaning. I also leave the oil tank full of Premium bar and chain oil. I like Bio Plus bar and chain oil when A LOT of oil may spray at me like when carving.