I use muckoff and autoglym insect remover on my 4/4 and they both do a good job.
I swill down with clean water, spray on the magic stuff and a few minutes later hose off.
The insects may need a gentle wipe with a wash mitt or sponge, but having been sprayed they are much easier to remove than with just soapy water.
I'm especially impressed with muckoff on wire wheels
