I've found stale fuel can severely inhibit starting ability. If I ride every weekend she tends to start 1 or 2 kicks. If I leave it weeks to months it can take some more effort.
Is your air filter somehow getting wet when washing? Any chance you're pulling some moisture into the engine when trying to start?
I tend to roll the engine through a few cycles before I commit. Find top dead center and get some good compression under the foot, and give a nice firm full kick with the choke on, no throttle. If it doesn't fire I repeat. I don't keep the bike on choke for more than 10 seconds usually.
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