I myself love these sponges and they do a terrific job.
BUT, you have to be careful with it. Its like a rotary. It can achieve amazing results, but if not used correctly, it can damage the finish.
I have been using these things for probably 9 years now and think they are the perfect solution to the bugs here in FL. However, I have seen them put marring in paint. My wife was using it to scrub (and I mean scrub) the love bugs off of her light blue metallic Scion. Instead of using finesse and leaving the muscles at the gym, she put force into it which required me to polish the front bumper.
Now days.. she`s very gentle with it and has the same fantastic results but with out the marring.
Its all in the technique.
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