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Equipment/wall cleaner should do the trick. We had the same problem last month. Stepped up from Simple Green, wheel cleaner then finally the wall cleaner. Complicating this was that we use reclaim to wet the foam and cloth. We hadn't kept up with regular buildup removal so it took a couple of passes at full strength to remove everything loosened up by previous passes.
We put it in a the soap dispenser on our portable pressure washer and spray it on the cloth on the low pressure setting. Soak the cloth and then run the wash and rinse. Repeat until cleaned.
I have had situations where I cut the top of a 55 Gallon Drum, removed the cloth and let it soak a few hours in a mix of Dawn and / or tunnel cleaner and then thru it in the washer with more of the same.