Plus the bow makes them really hard to clean. Scrapers and mag floats don't work very well at all.
You need to reach in and scrape from side to side or use a handheld pad.
We have a 155 bow and it is a beauty. We don't find it hard to claen with the magfloat. You may have to turn it a couple of times to find the right fit, but gets the tank clean. Ours has the dual overflows in both back corners!