I use brushes I bought at supply house typically used for boiler cleaning. Obviously, my brushes are dedicated to ice machines. But the units I have been cleaning are extremely moldy, I have to dismantle, clean & reassemble.
There is not much you can do to service a flaker except for adding the recommended amount of ice machine cleaner, cleaning the bin and chute. Anything else is big $$ for labor, and often the customer will just get a new machine. I believe the scotsman manual has a list of what tools are needed to break apart a flaker machine. The best tool I ever had for ice machines is a good screw holding screwdriver, and that Milwaukee right angle driver that they sell at Home Depot. There is not a lot of room for putting the screws back in when you disassemble for cleaning and repair.
The charge on the smaller machines is critical, so get some short short gauges with a valve. Sometimes when you put a hose on a machine to check it, the charge gets off and it never acts the same until you recover and weigh in again.
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