Muc-Off especially. I mean props to them for making their shit biodegradable (if it actually is) but I have seriously not encountered anything from dirt to effluvial grime that a spray bottle with water/dish soap mix and a rag didn’t take care of it brilliantly.

Like the only thing is really, really mucked up cassettes or sprockets and chains. Chains clean really easily with steel wool and the really, really mucked up cassettes just get tossed in vinegar for a bit and scrubbed with steel wool.