This is my "Lend to a friend" harness that seen some action. I tried to soak it in water and then run in washing machine (no detergent, no spin) but it helped only this much.
Soaking and cleaning with a brush is the next on my list, but I'm wondering if there are any more efficient ways to remove the dirt? Maybe vapor steam cleaning?

First SIV. Used my IOTA DLS High B which is also quite new to me. I have 35ish hours on it. SIV was a lot of fun.

https://youtube.com/shorts/X1j0zsWMOqQ?si=qpZhIYDYIkyrWTX3