Amalthea wheels clean well with soap and water but it's hard as crow to clean behind the spokes. I use a sponge and lots of time. Do any of you have tricks for cleaning the surfaces behind the spokes?

Are you trying to clean the back of the spokes or the inner wheel band behind the spokes?

I have two bricks with Argo wheels and I have modified two brushes, one to allow me to get into the small triangular holes, and the other to clean the larger slotted holes.

I bought brushes that have a rounded head made of wire and squashed them flat with pliers, giving me a long, narrow, full brush.

You might take a toilet brush, squash it flat and hook it a bit in order to work behind the spokes. I use one like this to clean my snowblower when I am done for that session.

Each season I wash our wheels, wipe them down with paint thinner to get the greasy and tarry stuff off, and then give them a good coat of wax front and back. I even wax inside the recessed portions of the spokes. I cannot buff all the wax, but I wipe off all I can get at with a rag wrapped around a stick. They are not smooth, but I am getting years of gunk out and dirt does not stick in there as well as it did.
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96 855R, 95 855,854, 90 744 Ti - 340,000 Volvo miles put on 7 bricks