I, too, was skeptical about these seemingly abrasive bug removing blocks. Many moons ago, I decided to do a side-by-side test on my friends new truck. We compared a Meguiar's Ultimate Wipe to the bug removing honeycomb-like block. NO DIFFERENCE, NO ADDED MARRING.
Tip: These are fantastic for use on
zinc coated exhaust pipes!
Sure, steel wool or a ScotchBrite pad or even a mils oxalic acid works, too, but all of these can eat away the zinc coating (especially the acid). The steel wool is the safest but if you push too hard or the pad compresses all the way, the steel WILL cut through the zinc.
About 2 months ago I happened to look for the patent for this thingy, as another thread on another forum had a discussion about them. Know what I found out on Wikipedia? It was originally patented by.... (drum roll)....
3M.
Bug Sponge
The 'bug sponge' was the brainchild of Ian Harold Brown of the 3M labs in St Paul, Minnesota. This sponge featured rigid polyether reinforced with an abrasive and hard-wearing polyethylene compound to effectively remove dried-on insect residue from vehicle windshields. Since its introduction in 1974, the bug sponge has been one of 3M's least known success stories.
If it is true, perhaps it will help put some minds at ease about trying one.
For the life of me, I could not locate the patent, nor the pending trademark ("?"). SMArnold shows an "?" on their version, but couldn't find it on the USPTO website...
Found a "dead" mark on the ScrubBug (serial#76175752)
Found another company using the moniker, no "?" or "?":
http://www.getcaughtmedia.com/scure_scrub.php