I took a couple of bottle tops, (the size you would get on a bottle of coke) including the one off the peroxide bottle and stood them with the grilles face down immersed in the H2O2. This left the drivers above the liquid. Worked beautifully for me and 24 hours later you could see the dissolved ear wax floating in the liquid. There was a little bit in the left side and a hell of a lot in the right.
I left them to dry By hanging them so the the grilles faced vertically downwards, put them on and it was like a brand new set of iems.
One other thought occurred to me. When was the last time you cleaned your ear canals? My right ear produces lots of wax, exacerbated by using iems. I use food grade H2O2 for this as well. You can hear it fizzing in your ears while it softens and dissolves the wax.
....and one final idea. The tips I was using with my ie80s were wide bore (like Auvios, JVC) and the grilles were quite close to the edge of the tips. When I switched to the Spinfits, not only did the sound improve (for me) but the narrower bores tend to trap the wax before it reaches the grilles.
Good luck with the cleaning process, let us know how you get on.