I use the same no spill cans he has and have for quite a while now but mine are filled with canned gas and they reside in the corner of the shop which is climate controlled anyway. Only thing I get in my fuel tank is some errant swarf I missed with my ever present paint brush that I use to clean around the caps (bar oil and gas) that I use to remove any debris prior to filling them. I don't believe I've ever changed either an in tank fuel filter nor an oil filter, ever. Always clean when I pull them out.
One thing I do-do is when I'm done using any saw, it comes in and gets blown off with compressed air first thing, before anything. and then I'll pull the bar and clean the groove and grease the roller nose (if applicable) reassemble it and I might flip it and reinstall it, depending on if I install a new sharpened loop. I'm somewhat anal about running sharp chains. The no spill cans IMO are **** and I use them for my lawn equipment as well but with corn squeezed gas instead. Once I saw the can he was using, I knew what his comments would be. Tractor supply sells them and so does Menards fyi.