: The blue 3M non scratch pad is replaceable. 
: The scrubber is placed  the end to allow you to clean glass in those       hard to reach areas .
: Works equally well on the  rear window or windshield.
: Designed to easily reach  behind  most third brake lights and rear         speakers to get the glass clean  film installation. 

The scrub pad is replaceable with our a standard blue 3M Scrub Pad 2 pack  part # (3MB-2PK)  when cut in half  you can make 4 replacement pads. .

The Scrubber Plus 3M