wanted to add some update here.
I tested the Tunze cleaner, hammer head and Flipper side by side. Tunze beats the other two hands down. It’s the blade angle which does the trick. The magnet itself is the weakest, which is actually a plus as well. It is much less strenuous.
I am solely using Tunze since then. cleaning has been so easy and only takes a matter of mins. Once in a month, I put the blade in to scrub any stubborn areas. The blades are easiest to put on the Tunze.
Since I started to use Tunze, have couple of times that I used hammer head outside unit with Tunze blade to scrape some portions which were really stubborn. The outside unit of hammerhead has very strong magnet.
Hopefully this will prevent others from throwing a lot of dollars experimenting. Tunze is hands down the winner.
Sam