How about adapting the car sponge to be able to be mounted on a long handle? This would be useful for washing/waxing big rigs. A truck wash costs about $35, extra if you want it waxed also. A lot of truck owners wash their rigs at home and being able to mount the car sponge on a long handle would allow the truck owner to wash and wax his big rig at home (or local wash bay) cheaper and probably cheaper. Wouldn't be as big a seller as the car sponge, but a side market nonetheless.
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