Quit wasting your time with sh*t you buy at the auto parts stores. I asked one day at the car wash what they used as it made the dirt and brake dust permanently damaged wheels of the RGC look like they were brand new again.
He pointed me to this product;
I had to order it online, but I guess you can buy it at O'Reilly's. Basically it's pure acid (you can see the hazard label on the side

). Instructions include putting gloves on... So dilution of some sort is probably safer for handling.
And yes, it works! And just because you don't have wire wheels doesn't mean it doesn't work. It works just fine on regular wheels. I use it on all mine.
Here are the instructions;
This is an acid based cleaner that will remove brake dust, tar, grime, rust, etc.
The wheel should be cool and sprayed with water first, then spray on our wire wheel cleaner and let it soak for 30 seconds to one minute, then spray it off the wheel completely. If the wheel is not clean enough, repeat these steps until the desired results are achieved.
NEVER APPLY THIS PRDUCT WITH YOUR HANDS, OR RUB WITH A RAG.
The acid will burn the skin. Always use rubber gloves and eye protection when using the product and let the product do the work, the user does not need to scrub, this product will do the cleaning.
DO NOT LEAVE THIS PRODUCT ON THE SURFACE LONGER THAN ONE MINUTE.
This product can stain wheel if not used properly. This product is safe for aluminum or mag wheel if diluted 1:1 with water and the above directions are followed.