Lots of different tools have been tried to get the strainer out. The 46mm socket would be the tool of choice, however sometimes you don't have room to get the wrench on the strainer, either because the axle is in the way or the hole in the sheet metal of off-center, preventing getting the socket on the strainer. In my case the hole was off center and so I fabricated the "spanner" shown to try to get it out - even with an air wrench it wouldn't budge. I ended up taking the tank out to get a clean shot with a breaker bar to get the strainer out.
Many people report that the strainer can be removed by just unscrewing it with the hose fitting. Those are the lucky ones.
It doesn't hurt to try any of the strategies that have been successful, but you never know what will end up working for you.
When you put it back in, use a bit of silicone grease to help prevent dissimilar metal corrosion in the future and always use a new O-ring to prevent leaks. If the hole is off-center, do yourself a favor and grind out the hole to allow a socket to be used the next time.
You can make or buy custom strainer removal tools as well.