[Moses]

Fikse makes some of the finest forged aluminum wheels on the planet. This is how they recommend that you clean their wheels;

With proper care, your wheel finish can be maintained for years.
First, and most importantly, NEVER let heavy brake dust accumulate on the wheels for an extended period. Frequent cleaning is essential--much like a fine car finish. Most brake pad material becomes highly acidic when mixed with rain or water. This acidic mix of brake dust and water can damage any wheel if left on them too long.

Second, it is important to avoid using off-the-shelf "Wheel Cleaner" products which are typically designed for use on lower quality cast metals. These, too are usually far too acidic for high performance wheels. Fikse recommends a 50/50% mix of biodegradeable cleaner called Simple Green and cold water. Never use hot water on aluminum, and always let the wheels cool to room temperature before cleaning. Use a natural sable bristle paint brush (available in the paint department of most hardware stores) to clean the lug pockets and spoke corner areas.

Third, clean using this process:

Spray the wheel with the 50/50 Simple Green/water mix.
Let stand for 15-30 seconds, using the soft sable brush to loosen the dirt as mentioned,
Rinse with cold water.
Repeat this process as necessary to get the wheel fully clean.
To dry the wheel, drive the car around the block to fling off excess water, then pat the wheel gently with a soft, dry, cotton cloth.