In terms of no machine or any forms of electrical substance how can you use clothes, brush and saop to perfectly clean a car seat?

I’ve been detailing a little under a year, and I’m just so lost on how detailers are able to get the inner wheel barrels so clean? I struggle with this a lot. Im referring to the red portion in the picture. I’ve used PNS break buster as well as Adams wheel cleaner full strength but I still never seem to be able to get it fully clean. Tried iron remover as well. Usually I can only get it about 50% clean. Even on newer cars. There’s always a bunch of leftover break dust and I hate leaving my clients rims like that. Any advice? Should I start using wheel acid instead?

I use the Bissell Bark Bath. I can also wash my dog with it.

So randomly lately I’ve gotten more and more couch cleaning request from word of mouth… I am curious to know what others charge for this type of service as it’s not related to mobile detailing necessarily. Thanks,

Any experienced detailer who’d like to come work for or with us?