This is the most ingenious and advanced magnetic glass cleaner we have seen. It has a soft side and a scraper side.
Srape Flip and Clean (for aquarium glass up to 10mm). See instructions below or click on this link to see a video of this in real action.

Instructions:

Step 1
Put the thin part of the Mag-Flip into the aquarium at the front window with the cleaning material in sight. This part will sink to the bottom slowly with the scraper downwards. Put the handle on the outside in front of inner part with logo on top. The magnets attract and you can start cleaning the glass with the soft side..

Step 2
To flip the inner unit to use the scraper, completely remove the handle from the window at least 5” or 10 cm and rotate it 180 degrees (logo up to logo down).

Step 3
Place the handle back on the window about 2”or 5 cm on either side of the inner unit. IMPORTANT: Make sure the top of the handle is at same level as the top of the inner unit.

Step 4
Slide the handle towards the inner unit until flipping occurs. Make sure the top of the handle is at the same level as the top of the inner unit. To flip back to the soft side again go to step 2.