Sir, why the Sonax Sponge and not the yellow one with what looks like honeycomb?
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My process for bug removal is this:
Spray the area with an orange degreaser and let dwell for a few minutes.
Then wash the car normally. This will remove the vast majority of them. If any are left, I spray again with orange degreaser, let the product work for a few mins again then use a microfiber towel with orange degreaser soaked in a small part of it to wipe what is left.
This process will remove what ever wax or sealant on you had on, so make sure to re-apply your product of choice to protect the pannel once more. Of course degreasers don't affect coatings so if you have one on, you are good ;)
I washed the car the other day and forgot to update. I actually found the old bottle of Rain-x Bug Spray. I put it on and let it sit for about 5 minutes and then used my new bug sponge to scrub the caked on bugs, then pressure washed it all off. Came off like a dream, i was surprised. I think the key was waiting to let it bite into the bugs, and then using that bug brush was a great help.
The Sonax sponge just works well. My experience is it's pretty safe, doesn't need to be soaked to loosen up, cleans well, and is durable.
One more thing that hasn't been mentioned is a technique that Mike Phillips champions. That is to soak a microfiber and lay it on stubborn bugs. I would think you could do this with car wash or a safe cleaner.
I've used Mike's technique on side mirror caps, but I've found it doesn't work very well for the front end of most cars. The bug splattered areas on the bumpers and front facia are vertical and there is no way to adhere a towel to those surfaces...which brings me back to the bug scrubber and bug remover product.