Thanks, rjt, JEN and DetailDoc! for your good suggestions and tips.
I have a good brush for the tires and rims bought long time ago. For the MF towels, I got a pack of 36 (16"x16") from costco, there were made by Unitex International, I also got the MF mitts there, which include 3 MF mitts and two large drying MF towels. Lowes grout sponges were unused leftovers from my basement bar tiling project, finally they can be of some use again...... :D