50% water / 50% hydrogen peroxide in a spray bottle. Spray down the bug covered areas good. By the time you get the hose, bucket, sponges, and car wash ready the bugs have bubbled up and they wash off easy.
I've used expensive commercial cleaners that work ok, but nothing I've used works any better than inexpensive hydrogen peroxide. I don't dilute it since it's in solution already. Just spray it on and let it set for a few minutes and watch the bugs just dissolve. The wipe them off with a microfiber cloth. A 16 oz bottle of HP can be had for around a buck or buck and a half.
Peroxide works well. On my daily rider I have always sprayed the bugs down with lemon pledge. Wipe them off in about 10 min. Use it on about everything up front including windshield. Ole racer trick.....maybe not on a show bike. But it's always in my bags on the road.
Just take it to your local car wash and spray tire cleaner on it, let it set for a bit then high pressure away. Anything that's left over just wipe with a towel should work. Just don't let the bugs stay on your bike too long as their guts can pit your bike after a good while.
At least this works for me at my car wash