We have switched to water based adhesive, makes a big difference.
The oven cleaner with caustic soda gets the painted parts looking like new.
I try not to leave it standing for too long before using a wet scrub pad to remove it.
I was told that the aluminum parts should not be cleaned with the same cleaner, it works well but the caustic soda is bad for the metal.
I'm using a citrus based spray on that I found at a bicycle shop, I also use it for my bic chain, it's works well on the aluminum.
Soon my MHM will look like new.